开发过程中可能会遇到这种情形，由于业务逻辑可能相对复杂，我们封装了很多不同的View，可能会遇到多层嵌套的情况，那么事件View的事件应该如何处理呢？因为事件交给View来处理在逻辑上是不合理的，一般都会交给控制器来处理，那么应该如何实现呢？直接进入正题----
通过响应者链来实现View的事件传递
核心思路：UIView继承自UIResponder, 我们可以通过实现一个UIResponder的分类来处理事件传递，直接上代码：
@interface UIResponder (YMEvent)
/*
自定义事件传递方法
*/
- (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
两个自定义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:@"一个按钮" 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":@"按钮点击后传递的参数"}];
}
@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(@"传递的信息: %@",params);
}
ViewController中实现分类方法
层级关系
