首先 Git地址 PEPhotoCropEditor

• 在做答疑君iOS端设计的时候, 我们会对碰到的照片进行一次裁剪, 然后把用户选中的一题扔到服务器上边。 然后去进一步操作。 因为项目开发比较急， 所以在Git上边找到了这个开源的组建库。

PEPhotoCropEditor License MIT

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PEPhotoCropEditor is image cropping library for iOS, similar to the Photos.app UI.

<img src="https://raw.github.com/kishikawakatsumi/PEPhotoCropEditor/master/Screenshots/ss01.png" alt="ScreenShot 1" width="280px" style="width: 280px;" /> <a href="https://vimeo.com/66661806"><img src="https://raw2.github.com/kishikawakatsumi/PEPhotoCropEditor/master/Screenshots/movie03.gif" style="width: 242px; height: 476px;" alt="Movie 1" /></a>

Features

• Both iPhone/iPad available
• Works fine any device orientations
• Support pinch gesture to zoom
• Support rotation gesture

System requirements

• iOS 5.0 or higher

Installation

CocoaPods

pod 'PEPhotoCropEditor'

Usage

Use view controller component

 PECropViewController *controller = [[PECropViewController alloc] init];
 controller.delegate = self;
 controller.image = self.imageView.image;
 
 UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:controller];
 [self presentViewController:navigationController animated:YES completion:NULL];

Or use the crop view directly

self.cropView = [[PECropView alloc] initWithFrame:contentView.bounds];
[self.view addSubview:self.cropView];

Get the cropped image

delegate method

- (void)cropViewController:(PECropViewController *)controller didFinishCroppingImage:(UIImage *)croppedImage
{
    [controller dismissViewControllerAnimated:YES completion:NULL];
    self.imageView.image = croppedImage;
}

retrieve from view directly

UIImage *croppedImage = self.cropView.croppedImage;

Keep crop aspect ratio while resizing

controller.keepingCropAspectRatio = YES;

self.cropView.keepingCropAspectRatio = YES;

Specify crop rect by image size based

// e.g.) Cropping center square
CGFloat width = image.size.width;
CGFloat height = image.size.height;
CGFloat length = MIN(width, height);
controller.imageCropRect = CGRectMake((width - length) / 2,
                                      (height - length) / 2,
                                      length,
                                      length);

// e.g.) Cropping center square
CGFloat width = image.size.width;
CGFloat height = image.size.height;
CGFloat length = MIN(width, height);
self.cropView.imageCropRect = CGRectMake((width - length) / 2,
                                         (height - length) / 2,
                                         length,
                                         length);

Reset back crop rect to original image size and rotation

[controller resetCropRect];

[self.cropView resetCropRect];

License

PEPhotoCropEditor is available under the MIT license. See the LICENSE file for more info.