Ios-target-action Design Pattern Understanding

Ios-target-action Design Pattern Understanding

The essence of Target-action's design pattern is that the event generated in host invokes the action method of target.

Below we use a uiview to implement the UIButton click event.

@interface custombutton:uiview-(void) Addcustombutton: (ID) Target andselector: (SEL) action; @end @implementation custombutton{    ID _target;    SEL _action;} -(void) Addcustombutton: (ID) Target andselector: (SEL) action{    if (target==_target) {        return;    }        _target = target;    _action = action;} -(void) Touchesbegan: (Nsset *) touches withevent: (Uievent *) event{}-(void) touchesended: (Nsset *) touches withevent: ( Uievent *) event{    if (_target) {        if ([_target respondstoselector:_action]) {            [_target performselector:_ Action withobject:self];}}    

Use

-(void) viewdidload {    [super viewdidload];    Additional setup after loading the view, typically from a nib.        CustomButton *btn = [[CustomButton alloc]initwithframe:cgrectmake (0, +,--)];    Btn.backgroundcolor = [Uicolor redcolor];    [Btn addcustombutton:self andselector: @selector (hello:)];    [Self.view addsubview:btn];    } -(void) Hello: (id) sender{    NSLog (@ "Hello customer");}

Run results

2015-03-29 17:09:03.803 target_action[1863:89334] Hello Customer

Running Memory state:

Ios-target-action Design Pattern Understanding