IOS ui-View controller life cycle, load method, and modal view methods

1 #import "ViewController.h"2 #import "SecondViewController.h"3 4 @interfaceViewcontroller ()5 6 @end7 8 @implementationViewcontroller9 Ten  One //the life cycle of the view controller A //How to load a view controller - //Modal View Method -  the /* - //View Controller loading method - -(instancetype) Init - { + Self = [super init]; - if (self) { + //Properties, member variables A //Never initialize the control in this place at     } - return self; - } -  - -(Instancetype) Initwithnibname: (NSString *) Nibnameornil Bundle: (NSBundle *) Nibbundleornil - { in //Initialize control (control created with nib file) - //IB (. xib file) No Stroyboard before this file is called a nib file to } +  - -(void) Loadview the { * //Initialize attempted with $ }Panax Notoginseng */ -  the  + //called when the view load is complete, the method that is called in the View controller (pseudo-first) A- (void) Viewdidload { the [Super Viewdidload]; +NSLog (@"Viewdidload"); -      $Self.view.backgroundColor =[Uicolor Cyancolor]; $      -UIButton *btn =[UIButton Buttonwithtype:uibuttontypesystem]; -[Btn Setframe:cgrectmake ( the, -, -, -)]; the[BTN Settitle:@"Next"Forstate:uicontrolstatenormal]; - [btn Setbackgroundcolor:[uicolor orangecolor];Wuyi [btn addtarget:self Action: @selector (Modelmethod) forcontrolevents:uicontroleventtouchupinside]; the [Self.view addsubview:btn]; -      Wu } - #pragmaMark-life Cycle About //called when the view (each time) is about to appear $- (void) Viewwillappear: (BOOL) Animated - { - [Super viewwillappear:animated]; -NSLog (@"Viewwillappear"); A      + } the //view (each time?) ) is called when the completion occurs -- (void) Viewdidappear: (BOOL) Animated $ { the [Super viewdidappear:animated]; theNSLog (@"Veiwdidappear"); the      the } - //the view (each time) is going to disappear when the call in- (void) Viewwilldisappear: (BOOL) Animated the { the [Super viewwilldisappear:animated]; AboutNSLog (@"Viewwilldisappear"); the      the } the //call when the view disappears +-(void) Viewdiddisappear: (BOOL) Animated - { the [Super viewdiddisappear:animated];BayiNSLog (@"Viewdiddisappear"); the      the } -  - #pragmaMark-model View method (Modal view methods) the- (void) Modelmethod the { the     //view toggle, switch to next view theSecondviewcontroller *SECONDVC =[[Secondviewcontroller alloc] init]; -Secondvc.modaltransitionstyle =Uimodaltransitionstylepartialcurl; the  the     //go to a view the [self PRESENTVIEWCONTROLLER:SECONDVC animated:yes completion:nil];94      the      the } the 98 #pragmaMark-other System Method About- (void) didreceivememorywarning { - [Super didreceivememorywarning];101 }102 103 @end

1 #import "SecondViewController.h"2 3 @interfaceSecondviewcontroller ()4 5 @end6 7 @implementationSecondviewcontroller8 9- (void) Viewdidload {Ten [Super Viewdidload]; OneNSLog (@"Viewdidload"); A      -Self.view.backgroundColor =[Uicolor Darkgraycolor]; -      theUIButton *btn =[UIButton Buttonwithtype:uibuttontypesystem]; -[Btn Setframe:cgrectmake ( the, -, -, -)]; -[BTN Settitle:@" Back"Forstate:uicontrolstatenormal]; - [btn Setbackgroundcolor:[uicolor whitecolor]; + [btn addtarget:self Action: @selector (Backmethod) forcontrolevents:uicontroleventtouchupinside]; - [Self.view addsubview:btn]; +      A } at- (void) Backmethod - { -     //back to previous view - [self dismissviewcontrolleranimated:yes completion:nil]; - } -  in- (void) didreceivememorywarning { - [Super didreceivememorywarning]; to}

IOS ui-View controller life cycle, load method, and modal view methods