Question

我在尝试通过UIView获取触摸事件时遇到了麻烦，并附上了儿童视图。

我想要做各种各样的图像，所以我有兴趣阅读它们上的触摸事件。它工作正常，直到我决定将它们分组为UIView，所以我猜我需要打开或关闭一些设置以让事件通过。

[TouchImageView.h] -------------------------------------------------------

@interface TouchImageView : UIImageView

[TouchImageView.m] -------------------------------------------------------

- (id)initWithFrame:(CGRect)aRect {
    if (self = [super initWithFrame:aRect]) {
        // We set it here directly for convenience
        // As by default for a UIImageView it is set to NO
        self.userInteractionEnabled = YES;
        state = 0 ;
        rect = aRect ;
    }
    return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    // Do what you want here
    NSLog(@"touchesBegan!" );
}

[in my delegate's didFinishLaunchingWithOptions] -------------------------

NSArray *myImages = [NSArray arrayWithObjects:
                     [UIImage imageNamed:@"front-photos.jpg"],
                     [UIImage imageNamed:@"front-films.jpg"],
                     [UIImage imageNamed:@"front-presentations.jpg"],

mainMenuView = [[UIView alloc] init ] ;
mainMenuView.userInteractionEnabled = YES;    // tried setting this to both YES and NO. Same result.
[self.viewController.view addSubview:mainMenuView] ;

myImage = [[TouchImageView alloc] initWithFrame:CGRectMake(0.0f, menuTopHeight, menuButtonWidth, menuButtonHeight)];
[myImage setImage:[myImages objectAtIndex:0]] ;
[mainMenuView addSubview:myImage] ;

有人可以告诉我我做错了什么吗？我在这个主题上看过很多关于SO的类似帖子，但大多数关于设置userInteractionEnabled（？）

Answer 1

事实证明，我需要为UIView定义一个框架。所以我改变了

mainMenuView = [[UIView alloc] init] ;

进入这个：

mainMenuView = [[UIView alloc] initWithFrame:[UIScreen mainScreen] bounds] ;

它再次起作用。

Answer 2

首先mainMenuView.userInteractionEnabled = NO;应为YES 此外UIImageView userInteractionEnabled已将[mainMenuView addSubview:myImage] ; //add myImage.userInteractionEnabled = YES;设为NO，因此您必须将其设置为YES

此行之后

{{1}}

touchevents不会从子视图内部触发

2 个答案: