{"id":1023,"date":"2021-09-07T07:00:03","date_gmt":"2021-09-07T07:00:03","guid":{"rendered":"https:\/\/topviecit.vn\/blog\/?p=1023"},"modified":"2023-01-16T02:25:51","modified_gmt":"2023-01-16T02:25:51","slug":"cau-phong-van-ios-developer","status":"publish","type":"post","link":"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/","title":{"rendered":"Top 8 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n ph\u1ed5 bi\u1ebfn cho iOS developer"},"content":{"rendered":"\n<p>L\u1eadp tr\u00ecnh vi\u00ean iOS l\u00e0 v\u1ecb tr\u00ed c\u00f4ng vi\u1ec7c h\u1ea5p d\u1eabn v\u1edbi m\u1ee9c thu nh\u1eadp kh\u1ee7ng m\u00e0 nhi\u1ec1u b\u1ea1n tr\u1ebb m\u01a1 \u01b0\u1edbc. Tuy nhi\u00ean \u0111\u1ec3 g\u00e2y \u1ea5n t\u01b0\u1ee3ng v\u00e0 l\u1ecdt v\u00e0o m\u1eaft xanh nh\u00e0 tuy\u1ec3n d\u1ee5ng l\u00e0 \u0111i\u1ec1u kh\u00f4ng d\u1ec5 d\u00e0ng. V\u00ec v\u1eady b\u1ea1n c\u1ea7n n\u1eafm ch\u1eafc b\u1ed9 <strong><a href=\"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00e2u ph\u1ecfng v\u1ea5n iOS developer<\/a> <\/strong>\u0111\u1ec3 t\u1ea1o l\u1ee3i th\u1ebf tr\u01b0\u1edbc nh\u1eefng \u1ee9ng vi\u00ean kh\u00e1c. D\u01b0\u1edbi \u0111\u00e2y, <strong><a href=\"https:\/\/topviecit.vn\/\" target=\"_blank\" rel=\"noreferrer noopener\">topviecit.vn<\/a><\/strong> gi\u1edbi thi\u1ec7u b\u1ed9 8 c\u00e2u h\u1ecfi ph\u1ed5 bi\u1ebfn nh\u1ea5t cho v\u1ecb tr\u00ed l\u1eadp tr\u00ecnh vi\u00ean iOS developer gi\u00fap b\u1ea1n c\u00f3 s\u1ef1 chu\u1ea9n b\u1ecb k\u1ef9 c\u00e0ng.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_63 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/#Cau_1_ARC_la_gi\" title=\"C\u00e2u 1: ARC l\u00e0 g\u00ec?\">C\u00e2u 1: ARC l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/#Cau_2_Khi_nao_ARC_duoc_su_dung_va_khong_duoc_su_dung\" title=\"C\u00e2u 2: Khi n\u00e0o ARC \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng?\">C\u00e2u 2: Khi n\u00e0o ARC \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/#Cau_3_Neu_su_khac_biet_giua_2_bien_Strong_va_Weak\" title=\"C\u00e2u 3: N\u00eau s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa 2 bi\u1ebfn Strong v\u00e0 Weak?\">C\u00e2u 3: N\u00eau s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa 2 bi\u1ebfn Strong v\u00e0 Weak?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/#Cau_4_Vay_bien_Weak_su_dung_trong_truong_hop_nao\" title=\"C\u00e2u 4: V\u1eady bi\u1ebfn Weak s\u1eed d\u1ee5ng trong tr\u01b0\u1eddng h\u1ee3p n\u00e0o?\">C\u00e2u 4: V\u1eady bi\u1ebfn Weak s\u1eed d\u1ee5ng trong tr\u01b0\u1eddng h\u1ee3p n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/#Cau_5_Phan_biet_cac_ham_viewDidLoad_viewWillAppear_viewDidAppear_viewWillDisappear\" title=\"C\u00e2u 5: Ph\u00e2n bi\u1ec7t c\u00e1c h\u00e0m: viewDidLoad, viewWillAppear, viewDidAppear, viewWillDisappear ?\">C\u00e2u 5: Ph\u00e2n bi\u1ec7t c\u00e1c h\u00e0m: viewDidLoad, viewWillAppear, viewDidAppear, viewWillDisappear ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/#Cau_6_Hay_neu_y_nghia_cua_tu_khoa_synthesize\" title=\"C\u00e2u 6: H\u00e3y n\u00eau \u00fd ngh\u0129a c\u1ee7a t\u1eeb kh\u00f3a @synthesize\">C\u00e2u 6: H\u00e3y n\u00eau \u00fd ngh\u0129a c\u1ee7a t\u1eeb kh\u00f3a @synthesize<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/#Cau_7_Trong_Objective-C_lap_trinh_vien_co_the_khai_bao_Public_Static_khong\" title=\"C\u00e2u 7: Trong Objective-C l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 khai b\u00e1o Public Static kh\u00f4ng?\">C\u00e2u 7: Trong Objective-C l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 khai b\u00e1o Public Static kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/#Cau_8_Hay_neu_cac_trang_thai_thuong_gap_cua_mot_ung_dung_iOS\" title=\"C\u00e2u 8: H\u00e3y n\u00eau c\u00e1c tr\u1ea1ng th\u00e1i th\u01b0\u1eddng g\u1eb7p c\u1ee7a m\u1ed9t \u1ee9ng d\u1ee5ng iOS\">C\u00e2u 8: H\u00e3y n\u00eau c\u00e1c tr\u1ea1ng th\u00e1i th\u01b0\u1eddng g\u1eb7p c\u1ee7a m\u1ed9t \u1ee9ng d\u1ee5ng iOS<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_1_ARC_la_gi\"><\/span><strong>C\u00e2u 1: ARC l\u00e0 g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u1edbi c\u00e2u h\u1ecfi n\u00e0y, nh\u00e0 tuy\u1ec3n d\u1ee5ng mu\u1ed1n ki\u1ec3m tra xem <strong><a href=\"https:\/\/topviecit.vn\/blog\/lap-trinh-vien-ios-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">l\u1eadp tr\u00ecnh vi\u00ean IOS<\/a><\/strong> c\u00f3 th\u1ef1c s\u1ef1 am hi\u1ec3u v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p l\u1eadp tr\u00ecnh trong iOS kh\u00f4ng. B\u1ea1n ch\u1ec9 c\u1ea7n tr\u1ea3 l\u1eddi ng\u1eafn g\u1ecdn v\u00e0 ch\u00ednh x\u00e1c v\u1ec1 kh\u00e1i ni\u1ec7m n\u00e0y l\u00e0 \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 tr\u1ea3 l\u1eddi: ARC l\u00e0 t\u1eeb vi\u1ebft t\u1eaft c\u1ee7a Automatic Reference Counting, ngh\u0129a l\u00e0 \u201cT\u1ef1 \u0111\u1ed9ng \u0111\u1ebfm s\u1ed1 l\u01b0\u1ee3ng tham chi\u1ebfu\u201d. \u0110\u00e2y l\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd t\u1ef1 \u0111\u1ed9ng \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p s\u1eb5n trong ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh Swift. N\u00f3 c\u00f3 vai tr\u00f2 t\u1ef1 \u0111\u1ed9ng ch\u00e8n th\u00eam c\u00e1c \u0111o\u1ea1n code \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh v\u00e0o \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh khi n\u00e0o \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng c\u1ea7n thi\u1ebft s\u1eed d\u1ee5ng c\u00e1c \u0111o\u1ea1n code n\u1eefa.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-1.jpg\" alt=\"B\u1ea1n n\u00ean tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi ng\u1eafn g\u1ecdn v\u00e0 \u0111i th\u1eb3ng v\u00e0o v\u1ea5n \u0111\u1ec1 ch\u00ednh \" class=\"wp-image-3429\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-1.jpg 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-1-640x400.jpg 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-1-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\"> <em>B\u1ea1n n\u00ean tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi ng\u1eafn g\u1ecdn v\u00e0 \u0111i th\u1eb3ng v\u00e0o v\u1ea5n \u0111\u1ec1 ch\u00ednh<\/em> <\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_2_Khi_nao_ARC_duoc_su_dung_va_khong_duoc_su_dung\"><\/span><strong>C\u00e2u 2: Khi n\u00e0o ARC \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u1edbi c\u00e2u h\u1ecfi tuy\u1ec3n d\u1ee5ng iOS developer n\u00e0y, nh\u00e0 tuy\u1ec3n d\u1ee5ng mu\u1ed1n th\u1ea5y c\u00e1ch b\u1ea1n \u1ee9ng d\u1ee5ng c\u00e1c t\u00ednh n\u0103ng th\u1ef1c t\u1ebf nh\u01b0 th\u1ebf n\u00e0o. Ch\u00fang s\u1ebd ch\u1ee9ng minh m\u1ee9c \u0111\u1ed9 hi\u1ec3u bi\u1ebft c\u1ee7a b\u1ea1n v\u1ec1 c\u00e1c k\u1ef9 thu\u1eadt l\u1eadp tr\u00ecnh, c\u00f4ng ngh\u1ec7 m\u1edbi tr\u00ean IOS c\u00f3 s\u00e2u s\u1eafc hay kh\u00f4ng.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 tr\u1ea3 l\u1eddi: ARC th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho phi\u00ean b\u1ea3n iOS 5 tr\u1edf l\u00ean. C\u00f2n v\u1edbi c\u00e1c phi\u00ean b\u1ea3n t\u1eeb iOS 4 tr\u1edf xu\u1ed1ng, l\u1eadp tr\u00ecnh vi\u00ean v\u1eabn c\u1ea7n t\u1ef1 code m\u00e3 \u0111\u1ec3 qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb. Ri\u00eang v\u1edbi c\u00e1c d\u1ef1 \u00e1n d\u00f9ng ARC nh\u01b0ng c\u00f3 s\u1eed d\u1ee5ng th\u00eam c\u00e1c code qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb th\u1ee7 c\u00f4ng nh\u01b0 retain, release,.. th\u00ec l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh v\u1ec1 c\u01a1 ch\u1ebf non-arc v\u00e0 s\u1eed d\u1ee5ng code \u0111\u00f3.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_3_Neu_su_khac_biet_giua_2_bien_Strong_va_Weak\"><\/span><strong>C\u00e2u 3: N\u00eau s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa 2 bi\u1ebfn Strong v\u00e0 Weak?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1c bi\u1ebfn l\u00e0 y\u1ebfu t\u1ed1 kh\u00f4ng th\u1ec3 thi\u1ebfu trong ho\u1ea1t \u0111\u1ed9ng l\u1eadp tr\u00ecnh c\u00e1c \u1ee9ng d\u1ee5ng. V\u00ec v\u1eady c\u00e2u h\u1ecfi so s\u00e1nh v\u00e0 ph\u00e2n bi\u1ec7t c\u00e1c bi\u1ebfn c\u0169ng s\u1ebd th\u01b0\u1eddng b\u1eaft g\u1eb7p trong qu\u00e1 tr\u00ecnh ph\u1ecfng v\u1ea5n v\u1ecb tr\u00ed iOS developer.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 tr\u1ea3 l\u1eddi: Bi\u1ebfn Strong khi tr\u1ecf \u0111\u1ebfn \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ebd s\u1edf h\u1eefu \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3 v\u00e0 l\u00e0m retainCount c\u1ee7a n\u00f3 t\u0103ng th\u00eam 1. C\u00f2n bi\u1ebfn Weak khi tr\u1ecf \u0111\u1ebfn \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ebd tham chi\u1ebfu gi\u00e1 tr\u1ecb \u0111\u00f3 v\u00e0 kh\u00f4ng l\u00e0m t\u0103ng retainCount c\u1ee7a n\u00f3. Khi gi\u00e1 tr\u1ecb retainCount v\u1ec1 0 th\u00ec \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ebd b\u1ecb h\u1ee7y v\u00e0 bi\u1ebfn Weak \u0111\u01b0\u1ee3c reset v\u1ec1 gi\u00e1 tr\u1ecb null.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_4_Vay_bien_Weak_su_dung_trong_truong_hop_nao\"><\/span><strong>C\u00e2u 4: V\u1eady bi\u1ebfn Weak s\u1eed d\u1ee5ng trong tr\u01b0\u1eddng h\u1ee3p n\u00e0o?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Sau khi b\u1ea1n \u0111\u00e3 ph\u00e2n bi\u1ec7t 2 bi\u1ebfn Strong v\u00e0 Weak, r\u1ea5t c\u00f3 th\u1ec3 nh\u00e0 tuy\u1ec3n d\u1ee5ng s\u1ebd mu\u1ed1n \u0111\u00e0o s\u00e2u v\u1ec1 nh\u1eefng tr\u01b0\u1eddng h\u1ee3p \u1ee9ng d\u1ee5ng 2 bi\u1ebfn n\u00e0y. Qua \u0111\u00f3 h\u1ecd s\u1ebd x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c iOS developer hi\u1ec3u bi\u1ebft t\u01b0\u1eddng t\u1eadn hay ch\u1ec9 t\u00ecm hi\u1ec3u s\u01a1 b\u1ed9 v\u1ec1 nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 tr\u1ea3 l\u1eddi: C\u00f3 2 tr\u01b0\u1eddng h\u1ee3p l\u1eadp tr\u00ecnh vi\u00ean n\u00ean s\u1eed d\u1ee5ng bi\u1ebfn Weak l\u00e0: 2 class c\u00f3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng reference \u0111\u1ebfn nhau v\u00e0 2 class c\u00f3 quan h\u1ec7 cha con. L\u00fac n\u00e0y, l\u1eadp tr\u00ecnh vi\u00ean s\u1ebd d\u00f9ng bi\u1ebfn weak v\u1edbi 1 class \u0111\u1ec3 tr\u00e1nh leak memory.&nbsp;<\/p>\n\n\n\n<p><strong>T\u00ecm hi\u1ec3u th\u00eam: <a href=\"https:\/\/topviecit.vn\/blog\/developer-la-gi-2\/\" target=\"_blank\" rel=\"noreferrer noopener\">Developer L\u00e0 Ngh\u1ec1 G\u00ec? M\u00f4 T\u1ea3 C\u00f4ng Vi\u1ec7c V\u00e0 M\u1ee9c Thu Nh\u1eadp C\u1ee7a Developer<\/a><\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-2.jpg\" alt=\"Nh\u00e0 tuy\u1ec3n d\u1ee5ng c\u00f3 th\u1ec3 \u0111\u01b0a ra c\u00e1c c\u00e2u h\u1ecfi Yes\/No \u0111\u1ec3 ki\u1ec3m tra n\u1ec1n t\u1ea3ng ki\u1ebfn th\u1ee9c c\u1ee7a b\u1ea1n \" class=\"wp-image-3431\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-2.jpg 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-2-640x400.jpg 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-2-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\"> <em>Nh\u00e0 tuy\u1ec3n d\u1ee5ng c\u00f3 th\u1ec3 \u0111\u01b0a ra c\u00e1c c\u00e2u h\u1ecfi Yes\/No \u0111\u1ec3 ki\u1ec3m tra n\u1ec1n t\u1ea3ng ki\u1ebfn th\u1ee9c c\u1ee7a b\u1ea1n<\/em> <\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_5_Phan_biet_cac_ham_viewDidLoad_viewWillAppear_viewDidAppear_viewWillDisappear\"><\/span><strong>C\u00e2u 5: Ph\u00e2n bi\u1ec7t c\u00e1c h\u00e0m: viewDidLoad, viewWillAppear, viewDidAppear, viewWillDisappear ?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e2u h\u1ecfi n\u00e0y nh\u00e0 tuy\u1ec3n d\u1ee5ng h\u01b0\u1edbng t\u1edbi vi\u1ec7c ki\u1ec3m tra s\u1ef1 am hi\u1ec3u s\u00e2u r\u1ed9ng v\u1ec1 ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n c\u1ee7a iOS developer. Ch\u1ec9 khi th\u1ef1c s\u1ef1 hi\u1ec3u r\u00f5 v\u1ec1 chuy\u00ean m\u00f4n th\u00ec l\u1eadp tr\u00ecnh vi\u00ean m\u1edbi c\u00f3 th\u1ec3 ph\u00e2n bi\u1ec7t c\u00e1c h\u00e0m n\u00e0y.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 tr\u1ea3 l\u1eddi: B\u1ea1n c\u00f3 th\u1ec3 ph\u00e2n bi\u1ec7t ch\u00fang d\u1ef1a tr\u00ean m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng c\u1ee7a c\u00e1c h\u00e0m<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>viewDidLoad \u0111\u01b0\u1ee3c g\u1ecdi \u0111\u1ea7u ti\u00ean khi kh\u1edfi t\u1ea1o m\u1ed9t view<\/li>\n\n\n\n<li>viewWillAppear \u0111\u01b0\u1ee3c g\u1ecdi khi view b\u1eaft \u0111\u1ea7u \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb b\u1ea5t c\u1ee9 l\u00fac n\u00e0o<\/li>\n\n\n\n<li>viewDidAppear \u0111\u01b0\u1ee3c g\u1ecdi sau khi view \u0111\u00e3 hi\u1ec3n th\u1ecb xong<\/li>\n\n\n\n<li>viewWillDisappear \u0111\u01b0\u1ee3c g\u1ecdi khi b\u1eaft \u0111\u1ea7u chuy\u1ec3n sang m\u00e0n h\u00ecnh kh\u00e1c<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_6_Hay_neu_y_nghia_cua_tu_khoa_synthesize\"><\/span><strong>C\u00e2u 6: H\u00e3y n\u00eau \u00fd ngh\u0129a c\u1ee7a t\u1eeb kh\u00f3a @synthesize<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>N\u00eau \u00fd ngh\u0129a c\u1ee7a m\u1ed9t t\u1eeb kh\u00f3a, 1 h\u00e0m hay m\u1ed9t bi\u1ebfn s\u1ebd th\u1ec3 hi\u1ec7n li\u1ec7u \u1ee9ng vi\u00ean c\u00f3 n\u1eafm ch\u1eafc c\u00e1c ki\u1ebfn th\u1ee9c v\u1ec1 s\u1eed d\u1ee5ng v\u00e0 \u00e1p d\u1ee5ng ch\u00fang t\u1ed1t hay kh\u00f4ng. B\u1ea1n c\u1ea7n t\u00ecm hi\u1ec3u r\u00f5 v\u1ec1 ch\u00fang v\u00e0 tr\u1ea3 l\u1eddi theo c\u00e1ch hi\u1ec3u c\u1ee7a ri\u00eang m\u00ecnh.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 tr\u1ea3 l\u1eddi: T\u1eeb kh\u00f3a @synthesize d\u00f9ng cho 1 bi\u1ebfn gi\u00fap n\u00f3 c\u00f3 th\u1ec3 tr\u00ecnh bi\u00ean d\u1ecbch t\u1ef1 \u0111\u1ed9ng \u0111\u1ec3 t\u1ea1o 2 h\u00e0m v\u1ec1 getter v\u00e0 setter. C\u00f2n n\u1ebfu l\u1eadp tr\u00ecnh vi\u00ean \u0111\u00e3 t\u1ef1 vi\u1ebft th\u00ec khi d\u00f9ng t\u1eeb kh\u00f3a n\u00e0y s\u1ebd kh\u00f4ng t\u1ea1o th\u00eam hai h\u00e0m n\u00e0y n\u1eefa.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_7_Trong_Objective-C_lap_trinh_vien_co_the_khai_bao_Public_Static_khong\"><\/span><strong>C\u00e2u 7: Trong Objective-C l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 khai b\u00e1o Public Static kh\u00f4ng?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u1edbi c\u00e2u h\u1ecfi l\u1ef1a ch\u1ecdn c\u00f3 hay kh\u00f4ng, b\u1ea1n c\u1ea7n th\u1ec3 hi\u1ec7n th\u00e1i \u0111\u1ed9 tr\u1ea3 l\u1eddi nhanh ch\u00f3ng, t\u1ef1 tin v\u1edbi \u0111\u00e1p \u00e1n c\u1ee7a m\u00ecnh. \u0110i\u1ec1u n\u00e0y s\u1ebd ch\u1ee9ng t\u1ecf b\u1ea1n c\u00f3 n\u1ec1n t\u1ea3ng ki\u1ebfn th\u1ee9c v\u1eefng ch\u1eafc v\u1ec1 c\u00f4ng vi\u1ec7c iOS developer.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 tr\u1ea3 l\u1eddi: C\u00f3 th\u1ec3. \u0110\u1ec3 khai b\u00e1o Public Static ta \u0111\u1ed3ng th\u1eddi s\u1eed d\u1ee5ng t\u1eeb kh\u00f3a static v\u00e0 d\u1ea5u + cho c\u00e1c function.<\/p>\n\n\n\n<p><strong>T\u00ecm hi\u1ec3u th\u00eam: <a href=\"https:\/\/topviecit.vn\/blog\/cau-hoi-phong-van-front-end-reactjs\/\" target=\"_blank\" rel=\"noreferrer noopener\">C\u00e2u H\u1ecfi Ph\u1ecfng V\u1ea5n Front-End ReactJS V\u00e0 H\u01b0\u1edbng D\u1eabn Tr\u1ea3 L\u1eddi<\/a><\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-3.jpg\" alt=\"N\u00ean gi\u1eef th\u00e1i \u0111\u1ed9 t\u1ef1 tin, b\u00ecnh t\u0129nh khi tr\u1ea3 l\u1eddi ph\u1ecfng v\u1ea5n iOS developer \" class=\"wp-image-3432\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-3.jpg 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-3-640x400.jpg 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/12\/cau-phong-van-ios-developer-topcv-3-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\"> <em>N\u00ean gi\u1eef th\u00e1i \u0111\u1ed9 t\u1ef1 tin, b\u00ecnh t\u0129nh khi tr\u1ea3 l\u1eddi ph\u1ecfng v\u1ea5n iOS developer<\/em> <\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_8_Hay_neu_cac_trang_thai_thuong_gap_cua_mot_ung_dung_iOS\"><\/span><strong>C\u00e2u 8: H\u00e3y n\u00eau c\u00e1c tr\u1ea1ng th\u00e1i th\u01b0\u1eddng g\u1eb7p c\u1ee7a m\u1ed9t \u1ee9ng d\u1ee5ng iOS<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e2u tr\u1ea3 l\u1eddi n\u00e0y gi\u00fap nh\u00e0 tuy\u1ec3n d\u1ee5ng \u0111\u00e1nh gi\u00e1 s\u1ef1 am hi\u1ec3u c\u1ee7a iOS developer v\u1ec1 \u1ee9ng d\u1ee5ng iOS th\u1ef1c t\u1ebf. V\u1edbi nh\u1eefng c\u00e2u h\u1ecfi \u1ee9ng d\u1ee5ng n\u00e0y, b\u1ea1n n\u00ean tr\u1ea3 l\u1eddi linh ho\u1ea1t d\u1ef1a tr\u00ean v\u1ed1n hi\u1ec3u bi\u1ebft c\u1ee7a m\u00ecnh.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 tr\u1ea3 l\u1eddi: \u1ee8ng d\u1ee5ng iOS th\u01b0\u1eddng c\u00f3 m\u1ed9t s\u1ed1 tr\u1ea1ng th\u00e1i sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Not running<\/li>\n\n\n\n<li>Inactive: tr\u1ea1ng th\u00e1i x\u1ea3y ra khi ng\u01b0\u1eddi d\u00f9ng lock m\u00e0n h\u00ecnh ho\u1eb7c \u1ee9ng d\u1ee5ng \u0111ang ch\u1ea1y th\u00ec c\u00f3 tin nh\u1eafn ho\u1eb7c cu\u1ed9c g\u1ecdi di\u1ec5n ra.<\/li>\n\n\n\n<li>Active: tr\u1ea1ng th\u00e1i \u1ee9ng d\u1ee5ng iOS ch\u1ea1y v\u00e0 x\u1eed l\u00fd c\u00e1c d\u1eef li\u1ec7u t\u1eeb ng\u01b0\u1eddi d\u00f9ng, h\u1ec7 th\u1ed1ng.<\/li>\n\n\n\n<li>Background: tr\u1ea1ng th\u00e1i m\u00e0 \u1ee9ng d\u1ee5ng ch\u1ea1y \u1edf ch\u1ebf \u0111\u1ed9 n\u1ec1n v\u00e0 c\u00f3 th\u1ec3 x\u1eed l\u00fd 1 s\u1ed1 t\u00e1c v\u1ee5.<\/li>\n\n\n\n<li>Suspended: tr\u1ea1ng th\u00e1i m\u00e0 \u1ee9ng d\u1ee5ng ch\u1ea1y \u1edf ch\u1ebf \u0111\u1ed9 n\u1ec1n v\u00e0 kh\u00f4ng th\u1ec3 x\u1eed l\u00fd t\u00e1c v\u1ee5 n\u00e0o, th\u01b0\u1eddng x\u1ea3y ra khi b\u1ed9 nh\u1edb thi\u1ebft b\u1ecb kh\u00f4ng \u0111\u1ee7.<\/li>\n<\/ul>\n\n\n\n<p><strong>C\u00f3 th\u1ec3 b\u1ea1n quan t\u00e2m: <a href=\"https:\/\/topviecit.vn\/blog\/lap-trinh-react-native-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">L\u1eadp Tr\u00ecnh React Native L\u00e0 G\u00ec? M\u00f4 T\u1ea3 C\u00f4ng Vi\u1ec7c V\u00e0 M\u1ee9c L\u01b0\u01a1ng React Native<\/a><\/strong><\/p>\n\n\n\n<p><strong>M\u1ed9t s\u1ed1 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n ios developer kh\u00e1c:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa Frame v\u00e0 Bound l\u00e0 g\u00ec?<\/li>\n\n\n\n<li>Single Inheritance trong Objective C l\u00e0 g\u00ec?<\/li>\n\n\n\n<li>S\u1ef1 kh\u00e1c nhau gi\u1eefa Frame v\u00e0 Bound?<\/li>\n\n\n\n<li>Gi\u1eefa deep coppy v\u00e0 shadow coppy c\u00f3 g\u00ec kh\u00e1c nhau?<\/li>\n\n\n\n<li>KVO v\u00e0 KVC trong objective C l\u00e0 g\u00ec?<\/li>\n\n\n\n<li>C\u00f3 nh\u1eefng c\u00e1ch n\u00e0o \u0111\u1ec3 h\u1ee7y 1 \u0111\u1ed1i t\u01b0\u1ee3ng outlet?<\/li>\n<\/ul>\n\n\n\n<p>Tr\u00ean \u0111\u00e2y l\u00e0 8 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n iOS developer m\u00e0 c\u00e1c \u1ee9ng vi\u00ean th\u01b0\u1eddng g\u1eb7p trong c\u00e1c bu\u1ed5i ph\u1ecfng v\u1ea5n. Hy v\u1ecdng nh\u1eefng <strong><a href=\"https:\/\/topviecit.vn\/blog\/chuyen-muc\/chia-se-kinh-nghiem\/\" target=\"_blank\" rel=\"noreferrer noopener\">chia s\u1ebb kinh nghi\u1ec7m<\/a><\/strong> n\u00e0y s\u1ebd gi\u00fap b\u1ea1n c\u00f3 s\u1ef1 chu\u1ea9n b\u1ecb t\u1ed1t h\u01a1n v\u00e0 t\u1ef1 tin b\u01b0\u1edbc v\u00e0o bu\u1ed5i ph\u1ecfng v\u1ea5n xin vi\u1ec7c s\u1eafp t\u1edbi. N\u1ebfu b\u1ea1n \u0111ang c\u00f3 nhu c\u1ea7u&nbsp;<strong><a href=\"https:\/\/www.topcv.vn\/tim-viec-lam-ios-developer\" target=\"_blank\" rel=\"noreferrer noopener\">t\u00ecm vi\u1ec7c l\u00e0m ios developer<\/a><\/strong>, h\u00e3y truy c\u1eadp v\u00e0o&nbsp;<a href=\"https:\/\/www.topcv.vn\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>TopCV<\/strong><\/a>&nbsp;ngay t\u1eeb h\u00f4m nay \u0111\u1ec3 ti\u1ebfp c\u1eadn c\u00e1c tin tuy\u1ec3n d\u1ee5ng h\u1ea5p d\u1eabn h\u01a1n nh\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u1eadp tr\u00ecnh vi\u00ean iOS l\u00e0 v\u1ecb tr\u00ed c\u00f4ng vi\u1ec7c h\u1ea5p d\u1eabn v\u1edbi m\u1ee9c thu nh\u1eadp kh\u1ee7ng m\u00e0 nhi\u1ec1u b\u1ea1n tr\u1ebb m\u01a1 \u01b0\u1edbc. Tuy nhi\u00ean \u0111\u1ec3 g\u00e2y \u1ea5n t\u01b0\u1ee3ng v\u00e0 l\u1ecdt v\u00e0o m\u1eaft xanh nh\u00e0 tuy\u1ec3n d\u1ee5ng l\u00e0 \u0111i\u1ec1u kh\u00f4ng d\u1ec5 d\u00e0ng. V\u00ec v\u1eady b\u1ea1n c\u1ea7n n\u1eafm ch\u1eafc b\u1ed9 c\u00e2u ph\u1ecfng v\u1ea5n iOS developer \u0111\u1ec3 t\u1ea1o [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3430,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"cybocfi_hide_featured_image":"","footnotes":""},"categories":[86,85],"tags":[865,863,190,187,188],"class_list":["post-1023","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chia-se-kinh-nghiem","category-meo-tim-viec","tag-cau-hoi-phong-van-ios","tag-developer-ios","tag-ios-developer-cv","tag-ios-developer-la-gi","tag-tuyen-dung-ios-developer"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Top 8 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n ph\u1ed5 bi\u1ebfn cho iOS developer<\/title>\n<meta name=\"description\" content=\"B\u1ea1n s\u1eafp s\u1eeda \u1ee9ng tuy\u1ec3n v\u00e0o v\u1ecb tr\u00ed IOS developer nh\u01b0ng lo l\u1eafng cho bu\u1ed5i ph\u1ecfng v\u1ea5n? 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