Question

示例：

我在当前视图中有两个按钮，当我点击该按钮时，它会在当前UIViewController中推送UINavgitionController。

这是我的代码：

dispatch_async(dispatch_get_main_queue(), { () -> Void in
    self.navigationController?.pushViewController(pvc, animated: true)
})

但我发现了一个错误。当我快速点击按钮时，UIViewController推两次，为什么会这样？

PS：现在，我已经在很多UIViewController s中使用了这个代码，超过200次。

Answer 1

我也遇到了同样的问题，我通过创建UIButton类别解决了这个问题，只会采取独家触摸。

创建UIButton的类别

#import <objc/runtime.h> //Please import

    @implementation UIButton (ExclusiveTouch)

    + (void)load
    {
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            Class class = [self class];

            SEL originalSelector = @selector(willMoveToSuperview:);
            SEL swizzledSelector = @selector(inc_willMoveToSuperview:);

            Method originalMethod = class_getInstanceMethod(class, originalSelector);
            Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);

            BOOL didAddMethod =
            class_addMethod(class,
                            originalSelector,
                            method_getImplementation(swizzledMethod),
                            method_getTypeEncoding(swizzledMethod));

            if (didAddMethod) {
                class_replaceMethod(class,
                                    swizzledSelector,
                                    method_getImplementation(originalMethod),
                                    method_getTypeEncoding(originalMethod));
            } else {
                method_exchangeImplementations(originalMethod, swizzledMethod);
            }
        });
    }

    - (void)inc_willMoveToSuperview:(UIView *)newSuperview
    {
        // This is correct and does not cause an infinite loop!
        // See the link for an explanation
        [self inc_willMoveToSuperview:newSuperview];

        [self setExclusiveTouch:YES];
    }

单击按钮快速按两次UIViewController

1 个答案: