iOS接触UIImageView

Question

  - (void)viewDidLoad
 {
  [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
   container = [[UIView alloc] initWithFrame:self.view.frame];
UIImageView* main_im0 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"icon1.png"]];
[container addSubview:main_im0];
[self.view addSubview:container];

 }

 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *tt = [touches anyObject];

UIImageView *touchedview=(UIImageView*)[tt view];


NSArray *views = [container subviews];



 for (UIImageView* im in views)
 {
    UIImageView* focus=im;
    if (touchedview==focus)
    {

    }

}

}

我有一段代码来设置一个名为main_im0的ImageView，将其放入UIView容器中，然后将其放入视图中。 当我按一下main_im0时，我期望触摸功能会达到touchedview == focus的条件。 但是，我无法激活该条件？ 怎么了？

Answer 1

请启用

main_im0.userInteractionEnabled = YES;

默认情况下， UIImageView为No

Answer 2

杰森（Jason），也许我在误解您的代码，但是您是否不打算在UIView上实现点击手势呢？

您可以使用：

// enable user interaction with this view
main_img0.userInteractionEnabled = YES;

// setup a tap gesture to call a method once triggered (like a javascript mouseClick event)
UITapGesture *tapGesture = [[UITapGesture alloc] initWithTarget:self selector:@selector(myMethodToDoSomething)];

[main_img0 addGestureRecognizer:tapGesture];

// if you are not using Automatic Reference Counting, then remember to release your allocated tapGesture object
[tapGesture release];


...somewhere later in your code....


// method to do something
-(void)myMethodToDoSomething
{
    NSLog(@"This method executed");
}

现在，当您点击main_img0视图时，将执行方法“ myMethodToDoSomething”

顺便说一句，如果您只想使用自己的Photoshop设计的图像来创建自定义外观的按钮，则只需使用代码创建UIButton并设置UIButton的背景图像属性即可。 像这样：

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];
[button setImage:[UIImage imageNamed:@"mybutton.png"] forControlState:UIControlStateNormal];