在UIImageView的右上角添加UIButton

Question

我试图在UIImageView的右上角以编程方式创建一个UIButton，到目前为止我有一个UIImageView，我想在图像加载到图像视图时在UIImageView的右上边缘创建一个UIButton。我不知道怎么能实现这一目标。

vector

[self.img1 addsubView：button];

这里，img1是图像视图。我想在img1的右上角添加该按钮。

我怎样才能做到这一点？

Answer 1

[self.img1 addSubView:button];
[button setFrame:CGRectMake(self.img1.size.width-button.frame.size.width,0,button.frame.size.width, button.frame.size.height)];

Answer 2

您也可以使用自动布局。

NSMutableArray * constraints = [NSMutableArray array]; 
[constraints addObject:[NSLayoutConstraint constraintWithItem:self.contentView 
     attribute:NSLayoutAttributeTopMargin 
     relatedBy:NSLayoutRelationEqual 
     toItem:separatorView
     attribute:NSLayoutAttributeY
     multiplier:1.0
     constant:0]];
[constraints addObject:[NSLayoutConstraint constraintWithItem:self.contentView 
     attribute:NSLayoutAttributeRightMargin 
     relatedBy:NSLayoutRelationEqual 
     toItem:separatorView
     attribute:NSLayoutAttributeRight
     multiplier:1.0
     constant:0]];
[button addConstraints:constraints];
[self.img1 addsubView : button];

Answer 3

UIImageView *img1 = [[UIImageView alloc] initWithFrame:CGRectMake(imageX,imageY,imageWidth,imageHeight)];

float buttonWidth = 30;

UIButton *button =[ [UIButton alloc] initWithFrame:CGRectMake(img1.frame.size.width - buttonWidth,0, buttonWidth,buttonHeight)];

[self.view addSubView:img1];

[img1 addSubView:button];