如何以编程方式设置子视图的框架以使其适合其父视图？

Question

I need to programmatically do the following. How can I do this? The code should be dynamic enough to fit a portrait view inside landscape also. The views are not UIImageViews.

Answer 1

If you don't mind including the AVFoundation framework in your project, you can use: AVMakeRectWithAspectRatioInsideRect(CGSize aspectRatio, CGRect boundingRect);

Its documentation states:

Returns a scaled CGRect that maintains the aspect ratio specified by a CGSize within a bounding CGRect.

It can be used as:

subview.frame = AVMakeRectWithAspectRatioInsideRect(subview.bounds.size, superview.bounds);

Parameters:

aspectRatio : The width and height ratio (aspect ratio) you want to maintain.

boundingRect : The bounding rectangle you want to fit into.

Answer 2

float ratio = subView.bounds.size.height/subView.bounds.size.width;

[subView setFrame:CGRectMake(0,0,superView.bounds.size.width,superView.bounds.size.width*ratio)];
[subView setCenter:CGPointMake(superView.bounds.size.width/2,superView.bounds.size.height/2)];