ios - 关于 iOS 中的 setUserInteractionEnabled UIImageView

Question

我是 iOS 新手，我对 setUserInteractionEnabled 有疑问: 我有一个从 UIImageView 扩展的对象，例如:

@interface CustomImageView : UIImageView

@property (retain, nonatomic) NSString *sNameImage;
@property (retain, nonatomic) NSString *sID;
@property (assign, nonatomic) float nPointX;
@property (assign, nonatomic) float nPointY;

-(void)setPoint:(NSString *)sPoint;

然后当我将它添加到 UIView 时:

for(int i = 0; i < self.arrCustomImageView.count; i++)
{
    CustomImageView *cuiv = [self.arrCustomImageView objectAtIndex:i];
    NSData *data = [self readDataFromFile:cuiv.sNameImage];
    if(data != nil && data.length > 0)
    {
        UIImage *image = [[UIImage alloc] initWithData:data];
        CGRect r = CGRectMake(cuiv.nPointX, cuiv.nPointY, image.size.width, image.size.height);
        [cuiv setUserInteractionEnabled:FALSE]; /*or NO i tried all*/
        [cuiv setImage:image];
        cuiv.frame = r;
        [self addSubview:cuiv];
        [image release];
        image = nil;
    }
}

然后在 touchesBegan 中，我仍然在触摸它时捕获事件(触摸它时我仍然收到日志):|

然后源码touchBegan方法:

UITouch * touch = [touches anyObject];
for (UIView *aView in [self subviews])
{
    if (CGRectContainsPoint([aView frame], [touch locationInView:self]))
    {
        self.imvChoice = (CustomImageView *) aView;
        originalPoint = aView.frame.origin;
        offsetPoint = [touch locationInView:aView];
        nIndexChoice = [self.arrCustomImageView indexOfObject:aView];
        NSLog(@"log: %@ >> %@: id: %d", NSStringFromClass([self class]),NSStringFromSelector(_cmd), nIndexChoice);
        [self bringSubviewToFront:aView];
    }
}

我不认为这是问题，因为我已经尝试添加相同的 UIImageView，如下所示:

 for(int i = 0; i < [arrObject count]; i++)
{
    CustomObject *nsObj = [arrObject objectAtIndex:i];

    UIImageView *image1 = [self createUIImageView:[nsObj sName1] pointX:nsObj.pPoint1.x pointY:nsObj.pPoint1.y];
    image1.tag = i;
    [image1 setUserInteractionEnabled:FALSE];

    UIImageView *image2 = [self createUIImageView:[nsObj sName2] pointX:nsObj.pPoint2.x pointY:nsObj.pPoint2.y];
    image2.tag = i;
    [image2 setUserInteractionEnabled:TRUE];

    [self addSubview:image1];
    [self addSubview:image2];
    [image1 release];
    [image2 release];
}

它运行正常:|单击 image1 时我无法捕获事件，而 image2 可以。

所以我错了？请帮我解释一下!感谢大家的支持!

Answer 1

touchesBegan 接收整个 View Controller 的触摸，而不仅仅是单个 uiview。如果您将 userInteractionEnabled 设置为 false，则该 View 将不会收到任何特定于 View 的事件，例如 UITouchUpInside。

如果你想检查你的 touchesBegan 方法，如果用户点击了一个“禁用”的对象，你必须获得用户触摸你的 ViewController 的坐标，例如像这样

UITouch *touch = [[event allTouches] anyObject];
CGPoint touchPoint = [touch locationInView:self.view];

然后检查您的触摸点是否在您要检查的 View 对象的矩形内

if (CGRectContainsPoint(cuiv, touchPoint){
    if (cuiv.userInteractionEnabled) {
     // your element is enabled, do something
    } else {
     // your element is disabled, do something else
    }
}