触摸事件的传递

Posted 2020-06-13

提示：UIImageView的userInteractionEnabled 默认就是NO,因此UIImageView以及它的子控件默认是不能接触事件的

Main.storyboard

ViewController.m

//

//  ViewController.m

//  7A02.触摸事件的传递

//

//  Created by huan on 16/2/3.

//  Copyright © 2016年 huanxi. All rights reserved.

//

 

#import "ViewController.h"

 

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //当父控件不能接收触摸事件的时候，它的子控制件不在遍历

    //当触摸点不在父控件的事件，它的子控件也不在遍历

    

    //往图片添加一个按钮

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeContactAdd];

    [btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];

    [self.imageView addSubview:btn];

}

-(void)btnClick{

    NSLog(@"%s", __func__);

}

 

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    NSLog(@"%s %p", __func__, event);

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

 

@end

CZWhiteView.m(控制器的view)

#import "CZWhiteView.h"

 

@implementation CZWhiteView

 

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    NSLog(@"%s %p", __func__, event);

}

 

@end

CZRedView.m

#import "CZRedView.h"

 

@implementation CZRedView

 

/**

 * 不实现touchesBegan方法，默认把事件传给上一个响应者(接收事件，不处理，交给上一个响应者)

 */

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    NSLog(@"%s, %p", __func__, event);

    //调用了super 方法，相当于把事件传给上一个响应者

    [super touchesBegan:touches withEvent:event];

}

@end

CZGreen.m

#import "CZGreenView.h"

 

@implementation CZGreenView

 

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    NSLog(@"%s", __func__);

}

 

#pragma mark 判断当前的触摸点在不在自己的身上

-(BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event{

    

    //绿色左边的可以“响应事件”，右边不可以响应事件

    if (point.x <= self.bounds.size.width * 0.5) {

        return YES;

    }

//    BOOL pointInside = [super pointInside:point withEvent:event];

//    NSLog(@"%s %d", __func__, pointInside);

//    return pointInside;

    

    return NO;

}

 

@end

CZBlue.m

#import "CZBlueView.h"

 

@implementation CZBlueView

 

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    NSLog(@"%s", __func__);

}

@end