IOS-target-action: ios-target-action

IOS-target-action: ios-target-action

IOS-target-action Design Mode

The essence of the target-action design pattern is to call the target action Method for events generated in the host.

Next 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];    // Do any additional setup after loading the view, typically from a nib.        CustomButton *btn = [[CustomButton alloc]initWithFrame:CGRectMake(0, 100, 200, 200)];    btn.backgroundColor = [UIColor redColor];    [btn addCustomButton:self andSelector:@selector(hello:)];    [self.view addSubview:btn];    }-(void)hello:(id)sender{    NSLog(@"hello customer ");}

Running result

17:09:03. 803 Target_action [1863: 89334] hello customer

Running memory status: