用按钮放大图像？

Question

-(IBAction)bigger {

    must.bounds.size = CGSizeMake(must.bounds.size.width +5.0 , must.bounds.size.height +5.0);  
}

这是我输入的代码，但是我得到的错误是表达式不可分配。必须是一个uiimageview。每次按下按钮，我想让每个属性（高度和宽度）增加5.0。我怎样才能做到这一点。

Answer 1

您可能想要的是设置框架而不是边界。做类似的事情：

CGRect frame = must.frame;
frame.size.width += 5;
frame.size.height += 5;
must.frame = frame;

Answer 2

//here u can get the image as bigger without moving its center point


-(IBAction)bigger {


    CGRect _bounds = must.bounds;

    CGPoint centerPoint=must.center;

    _bounds.size = CGSizeMake(must.bounds.size.width + 5.0 , must.bounds.size.height + 5.0);

    must.bounds = _bounds;

    must.center = centerPoint;



}