Question

我想通过按下按钮创建一个UIImageView。我是这样做的：

- (IBAction) addPicture:(id)sender {
    imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0.0, 45.0, 324, 52.0)];
    imageView.image = [UIImage imageNamed:@"Picture.png"];
    [self.view addSubview:imageView];
}

我在.h中“创建”了这个imageView，因为我想在其他方法中使用ImageView。如何使用IBAction在方法中创建无限的UIImageViews，我可以在以后使用其他方法等等...每个imageView必须得到一个名字，或者？

例如，在我的app-idea中，用户可以使用按钮创建图像，然后他选择带触摸的图片并可以移动它并调整其大小。

我熟悉UIImageViews等的创建，因为到目前为止我只使用了预定义的UIImageViews（带有IB）等等。我希望得到一个有用的答案。感谢

Answer 1

UIView及其子类具有tag属性用于此目的：

 (IBAction) addPicture:(id)sender { 
    imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0.0, 45.0, 324, 52.0)]; 
    imageView.tag = 100;
    imageView.image = [UIImage imageNamed:@"Picture.png"]; 
    [self.view addSubview:imageView]; 
    [imageView release]; // Do not forget to release your object!
}

之后，您可以在视图控制器中的任何位置访问UIImageView对象：

UIImageView* imView = (UIImageView*)[self.view viewWithTag:100];

Answer 2

也许你应该这样做

NSMuteableArray *arrayOfImageViews = [[NSMuteableArray alloc] init];

//when you are ready to create your image views
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0.0, 45.0, 324, 52.0)];
imageView.tag = x; //some unique number for this image view.
[arrayOfImageViews addObject:imageView];
[self.view addSubview:imageView];
[imageView release];

//you can then create the next view and so on

//to reference the view later you can do either one of these things
//where x is the index of the image view. 
UIImageView *imageView = (UIImageView *)[arrayOfImageViews objectAt:x];

如何使用Button按钮创建无限制的UIImageViews，我可以在以后解决这个问题？

2 个答案: