開發(fā)過程中可能會(huì)遇到這種情形，由于業(yè)務(wù)邏輯可能相對(duì)復(fù)雜，我們封裝了很多不同的View，可能會(huì)遇到多層嵌套的情況，那么事件View的事件應(yīng)該如何處理呢？因?yàn)槭录唤oView來處理在邏輯上是不合理的，一般都會(huì)交給控制器來處理，那么應(yīng)該如何實(shí)現(xiàn)呢？直接進(jìn)入正題----

通過響應(yīng)者鏈來實(shí)現(xiàn)View的事件傳遞

核心思路：UIView繼承自UIResponder, 我們可以通過實(shí)現(xiàn)一個(gè)UIResponder的分類來處理事件傳遞，直接上代碼：

@interface UIResponder (YMEvent)
/*
    自定義事件傳遞方法
*/
- (void)routeEvent:(NSString *)eventName params:(NSDictionary *)params;

@end


@implementation UIResponder (YMEvent)

- (void)routeEvent:(NSString *)eventName params:(NSDictionary *)params {
    [self.nextResponder routeEvent:eventString params:params];
}
@end

兩個(gè)自定義View：

static NSString * const YMButtonEvent = @"YMButtonEvent";

@interface YMSubView : UIView
@property (nonatomic, strong) UIButton *button;
@end

@implementation YMSubView
- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.button = [UIButton buttonWithType:UIButtonTypeCustom];
        [self.button setTitle:@"一個(gè)按鈕" forState:UIControlStateNormal];
        [self.button setTitleColor:UIColor.blackColor forState:UIControlStateNormal];
        self.button.titleLabel.font = [UIFont systemFontOfSize:18];
        [self.button setBackgroundColor:UIColor.blueColor];
        [self.button addTarget:self action:@selector(event_buttonClick:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:self.button];
        self.button.frame = CGRectMake(20, 20, 180, 40);
    }
    return self;
}
- (void)event_buttonClick:(UIButton *)sender {
    [self.nextResponder routeEvent:YMButtonEvent params:@{@"name":@"按鈕點(diǎn)擊后傳遞的參數(shù)"}];
}
@end

@interface YMView : UIView

@end

@implementation YMView

- (instancetype)init
{
    self = [super init];
    if (self) {
        YMSubView *subView = [YMSubView new];
        subView.backgroundColor = UIColor.yellowColor;
        [self addSubview:subView];
        subView.frame = CGRectMake(10, 10, 260, 100);
    }
    return self;
}

@end

ViewController中：

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = UIColor.whiteColor;
    YMView *view = [YMView new];
    [self.view addSubview:view];
    view.backgroundColor = UIColor.purpleColor;
    view.frame = CGRectMake(10, 120, 300, 300);
}

- (void)routeEvent:(NSString *)eventString params:(NSDictionary *)params {
    if ([eventString isEqualToString:YMButtonEvent]) {
        [self handleButtonClick:params];
    } else {
        [self.nextResponder routeEvent:eventString params:params];
    }
}
- (void)handleButtonClick:(NSDictionary *)params {
    NSLog(@"傳遞的信息: %@",params);
}

ViewController中實(shí)現(xiàn)分類方法

層級(jí)關(guān)系

方法已經(jīng)寫得十分詳細(xì)了，如有其它更好地方法，歡迎交流！