检测 UIWebView 中的双击

Question

我正在尝试检测 uiwebview 中的双击。以下是代码。当我调试时，调试器进入 initwithcoder 但永远不会进入 Touchsbegan 或选择器函数。为什么会这样？

我将 UIWebView 放入我的 xib 文件中并将身份检查器类设置为 MyWebView

#import "MyWebView.h"


@implementation MyWebView

- (void) initTap {

    UITapGestureRecognizer *singleFingerDoubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleFingerDoubleTap:)];
    singleFingerDoubleTap.numberOfTouchesRequired = 1;
    singleFingerDoubleTap.numberOfTapsRequired = 2;
    [self addGestureRecognizer:singleFingerDoubleTap];
    [singleFingerDoubleTap release];
}

- (id)initWithCoder:(NSCoder*)coder
{
    if (self = [super initWithCoder:coder]) {
        // Initialization code.
        [self initTap];
    }
    return self;
}

- (id)initWithFrame:(CGRect)frame {

    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code.
        [self initTap];
    }
    return self;
}


-(void)handleSingleFingerDoubleTap:(id)sender {
    NSLog(@"Doulble click detected !");
}


- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    if (touch.tapCount == 2) {
            //put you zooming action here
        NSLog(@"Doulble click detected !");
    }
}


- (void)dealloc {
    [super dealloc];
}


@end

Answer 1

您只需将委托添加到识别器

singleFingerDoubleTap.delegate = self;

然后实现以下方法即可返回 YES。

#pragma mark Gesture recognizer delegate

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer 
{
    return YES;
}

不要忘记将符合声明添加到您的类文件中。

像这样

@interface ORWebViewController : UIViewController<UIGestureRecognizerDelegate>

Answer 2

如果您想覆盖双击时的默认缩放操作，这将为您提供指导。

更新：

请不要考虑上述引用，因为作者已经移动了它。

参考禁用默认缩放效果