Question

我正在为我的应用编写自定义UIButton。但是，我想为按钮添加完整的操作。这样我就可以从动作中返回BOOL，然后在按钮中执行一些代码（即显示动画），然后调用完成方法。

所以，理想情况下，我希望能够做到这样的事情：

[button addAction:^(){
    NSLog(@"Action!");
    return true;
} completion:^() {
    NSLog(@"Completion!");
    return true;
} forControlEvents:UIControlEventTouchUpInside];

如何覆盖UIControlEventTouchUpInside发生时会发生什么？或者是另一个有争议的问题。

Answer 1

您可以通过以下方式实现此目的：

CustomButton.h

@interface CustomButton : UIButton
- (void)addAction:(void (^)(CustomButton *button))action onCompletion:(void (^)(CustomButton *button))completion forControlEvents:(UIControlEvents)event;
@end

CustomButton.m

#import "CustomButton.h"

@interface CustomButton ()

@property (nonatomic, copy) void(^actionHandler)(CustomButton *button);
@property (nonatomic, copy) void(^completionHandler)(CustomButton *button);

@end

@implementation CustomButton

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/



- (void)addAction:(void (^)(CustomButton *button))action onCompletion:(void (^)(CustomButton *button))completion forControlEvents:(UIControlEvents)event
{
    self.actionHandler = action;
    self.completionHandler = completion;

    __weak __typeof__(self) weakSelf = self;
    [self addTarget:weakSelf action:@selector(buttonAction) forControlEvents:event];
}

- (void)buttonAction
{
    if (self.actionHandler) {
        self.actionHandler(self);
    }

    // This will execute right after executing action handler.
    // NOTE: If action handler is dispatching task, then execution of completionHandler will not wait for completion of dispatched task
    //       that should handled using some notification/kvo.
    if (self.completionHandler) {
        self.completionHandler(self);
    }
}


@end

有没有办法在自定义UIButton中调用TouchUpInside操作？

1 个答案: