裁剪UIImage以适合帧图像

Question

I need to crop a UIImage , taken with the device camera, so that it fits inside another UIImage , which represents a frame (with rounded borders and so on). Check the image below:

Using Aspect Fill

Using Aspect Fit

So, what I need is to remove the image excess that is out of the frame bounds. I tried using UIBezierPath , CGImageRef and other methods that I Googled but I'm not finding a solution for this.

Answer 1

In Interface Builder, use the following configuration:

There are two important settings, namely:

1. Mode: Aspect Fill

2. Clip Subviews

It can also be done programmatically:

[imageView setContentMode:UIViewContentModeScaleAspectFill];
[imageView setClipsToBounds:YES];

This will correctly fill the view with the image, keep its aspect ratio and hide what doesn't fit.

Answer 2

make a IBOutlet in your controller.

@property (retain)IBOutlet UIImageView* imageView;

and in -(void) viewDidLoad set

imageView.layer.masksToBounds = YES;

Answer 3

In interface Builder, access the Mode menu inside of the detail pane (the fourth one) and choose the right one for your UIImageView (I guess "center" or "aspect fit").

OLD ANSWER:

You can use the contentGravity property of CALayer to make it work

A constant that specifies how the layer's contents are positioned or scaled within its bounds.

  @property(copy) NSString *contentsGravity 

Answer 4

使用UIImageView并执行

imageView.contentMode = UIViewContentModeScaleAspectFit;