view中巧用响应链

在项目中使用响应链的地方

1. 在scrollView 中添加 slider

// - 方案一
-(BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event{

    if (CGRectContainsPoint(self.subView.frame, point)) {
        self.scrollEnabled = NO;
        return YES;
    }
    self.scrollEnabled = YES;
    return YES;
}

// - 方案二
-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
    if (CGRectContainsPoint(self.subView.frame, point)) {
        self.scrollEnabled = NO;
        return [super hitTest:point withEvent:event];
    }
    self.scrollEnabled = YES;
    return [super hitTest:point withEvent:event];
}

2. 设置 scrollview 做的选项卡的 view 在第一个选项上是可以左滑返回

// - 设置 scrollview 做的选项卡的 view 在第一个选项上是可以左滑返回

-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{

    if ([[super hitTest:point withEvent:event] isKindOfClass:[UIControl class]]) {
        return [super hitTest:point withEvent:event];
    }else{
        if ((self.contentOffset.x == 0) && (point.x < 30)) {
            return nil;
        }
         return [super hitTest:point withEvent:event];
    }

}

3. 让事件穿透view

// - 设置事件可以穿透 view
@implementation DYContainerBgView
/** 可以透过事件 */
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
    if ([super hitTest:point withEvent:event] == self) return nil;
    return [super hitTest:point withEvent:event];
}

@end

4. 事件传递的解析

// - 示例代码 : 
- (void)viewDidLoad {
    [super viewDidLoad];
    
    QGView *v1 = [[QGView alloc]initWithFrame:CGRectMake(90, 90, 200, 200)];
    v1.backgroundColor = [UIColor redColor];
    v1.testStr = @"v1";
    [self.view addSubview:v1];
    
    QGView *v2 = [[QGView alloc]initWithFrame:CGRectMake(90, 90, 180, 180)];
    v2.backgroundColor = [UIColor greenColor];
    v2.testStr = @"v2";
    [self.view addSubview:v2];
    
    QGView *v3 = [[QGView alloc]initWithFrame:CGRectMake(90, 90, 160, 160)];
    v3.testStr = @"v3";
    v3.backgroundColor = [UIColor redColor];
    [self.view addSubview:v3];
    
    QGView *v31 = [[QGView alloc]initWithFrame:CGRectMake(0, 0, 120, 120)];
    v31.backgroundColor = [UIColor greenColor];
    v31.testStr = @"v31";
    [v3 addSubview:v31];
    
    QGView *v32 = [[QGView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
    v32.testStr = @"v32";
    v32.backgroundColor = [UIColor redColor];
    [v3 addSubview:v32];
    
    QGView *v33 = [[QGView alloc]initWithFrame:CGRectMake(0, 0, 80, 80)];
    v33.backgroundColor = [UIColor greenColor];
    v33.testStr = @"v33";
    [v3 addSubview:v33];
}```
![在这里插入图片描述](https://img-blog.csdnimg.cn/20200511110319330.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI3MDc0Mzg3,size_16,color_FFFFFF,t_70)

// - 测试 :

1. 点击v3
2020-05-11 11:12:54.027766+0800 Demo_001[2008:56637] pointInside v3, ruturn : 1
2020-05-11 11:12:54.027995+0800 Demo_001[2008:56637] pointInside v33, ruturn : 0
2020-05-11 11:12:54.028168+0800 Demo_001[2008:56637] hitTest v33, ruturn : (null)
2020-05-11 11:12:54.028309+0800 Demo_001[2008:56637] pointInside v32, ruturn : 0
2020-05-11 11:12:54.028438+0800 Demo_001[2008:56637] hitTest v32, ruturn : (null)
2020-05-11 11:12:54.028569+0800 Demo_001[2008:56637] pointInside v31, ruturn : 0
2020-05-11 11:12:54.028674+0800 Demo_001[2008:56637] hitTest v31, ruturn : (null)
2020-05-11 11:12:54.029436+0800 Demo_001[2008:56637] hitTest v3, ruturn : >

2. 点击v33
2020-05-11 11:13:54.777979+0800 Demo_001[2008:56637] pointInside v3, ruturn : 1
2020-05-11 11:13:54.778181+0800 Demo_001[2008:56637] pointInside v33, ruturn : 1
2020-05-11 11:13:54.778399+0800 Demo_001[2008:56637] hitTest v33, ruturn : >
2020-05-11 11:13:54.778587+0800 Demo_001[2008:56637] hitTest v3, ruturn : >

3. 点击v31
2020-05-11 11:15:13.166848+0800 Demo_001[2008:56637] pointInside v3, ruturn : 1
2020-05-11 11:15:13.167039+0800 Demo_001[2008:56637] pointInside v33, ruturn : 0
2020-05-11 11:15:13.167145+0800 Demo_001[2008:56637] hitTest v33, ruturn : (null)
2020-05-11 11:15:13.167275+0800 Demo_001[2008:56637] pointInside v32, ruturn : 0
2020-05-11 11:15:13.167396+0800 Demo_001[2008:56637] hitTest v32, ruturn : (null)
2020-05-11 11:15:13.167503+0800 Demo_001[2008:56637] pointInside v31, ruturn : 1
2020-05-11 11:15:13.167669+0800 Demo_001[2008:56637] hitTest v31, ruturn : >
2020-05-11 11:15:13.167813+0800 Demo_001[2008:56637] hitTest v3, ruturn : >

4. 点击v1
2020-05-11 11:16:01.172527+0800 Demo_001[2008:56637] pointInside v3, ruturn : 0
2020-05-11 11:16:01.172711+0800 Demo_001[2008:56637] hitTest v3, ruturn : (null)
2020-05-11 11:16:01.172835+0800 Demo_001[2008:56637] pointInside v2, ruturn : 0
2020-05-11 11:16:01.172931+0800 Demo_001[2008:56637] hitTest v2, ruturn : (null)
2020-05-11 11:16:01.173068+0800 Demo_001[2008:56637] pointInside v1, ruturn : 1
2020-05-11 11:16:01.173249+0800 Demo_001[2008:56637] hitTest v1, ruturn : >

结论 : 当前的vc的所有subView, 自外向内调用; 再从找到view的subView中, 自外向内调用