UI Target/Action事例

<span style="font-size:18px;">#import "CustomViewDelegate.h"
typedef NS_ENUM(int, MyCustomViewType){
    MyCustomViewType_Down=0,
    MyCustomViewType_Up,
    MyCustomViewType_Drag
};

@interface CustomView : UIView
{
    id _target;
    SEL _action;
    MyCustomViewType _eventType;
}

- (void)addTarget:(id)target action:(SEL)action forMyEventType:(MyCustomViewType)eventType;



@end
</span>

<span style="font-size:18px;">@implementation CustomView



- (void)addTarget:(id)target action:(SEL)action forMyEventType:(MyCustomViewType)eventType
{
    _target=target;
    _action=action;
    _eventType=eventType;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (_eventType==MyCustomViewType_Down) {
        [_target performSelector:_action withObject:self];
    }
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (_eventType==MyCustomViewType_Drag) {
        [_target performSelector:_action withObject:self];
    }
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
   if (_eventType==MyCustomViewType_Up) {
        [_target performSelector:_action withObject:self];
    }
}



@end
</span>