可通过CocoaPods安装，只需添加下面一行到你的podfile：
pod 'DBCropImage'
版本更新指令：pod update --no-repo-update
一个专门裁剪图片轻量级的轮子，简单易用，功能丰富（高自由度的参数设定、支持旋转和缩放、拖动），能满足绝大部分裁剪的需求。源代码公开，具体详细实现逻辑参数都在里面。非常支持自定义。
目前功能：
✅ 支持任意角度360度的旋转；
✅ 高自由度的参数设定，包括裁剪区域颜色大小、裁剪宽高比等；
✅支持固定或者可移动的裁剪框
✅ 支持固定或者可移动的裁剪框
✅ 裁剪算法公开，轻量级，非常适合自定义为适合自己的项目
DBCropImageController *vc = [[DBCropImageController alloc] init];
vc.lineColor = UIColor.whiteColor;//裁剪框线条眼色
vc.isShowShaw = true; //裁剪框线条是否显示阴影
vc.lineWidth = 2; //裁剪框线条的宽度
vc.isFixCropArea = false; //是否固定裁剪框
vc.widthHeightRate = 3/4.0;//设置宽高比例
vc.cropAreaHeight = 50; //设置最小裁剪高度
vc.image = image; //传入裁剪图片
//裁剪图片回调
vc.clippedBlock = ^(UIImage * _Nonnull clippedImage) {
CupedResultVC *ResultVC = [[CupedResultVC alloc] init];
ResultVC.resultImage = clippedImage;
ResultVC.modalPresentationStyle = 0;
[self presentViewController:ResultVC animated:YES completion:nil];
};
//取消裁剪
vc.cancelClipBlock = ^{
[self dismissViewControllerAnimated:YES completion:nil];
};
vc.modalPresentationStyle = 0;
[self presentViewController:vc animated:YES completion:nil];
//操作UIKit上下文的操作方式是线程安全的,但你似乎无法在一个线程之外创建一个除了主程序,因为UIGraphicsBeginImageContextWithOptions“应该只在主程序中调用线程“,但仍然这样做的工作是完美的
- (UIImage *)clipImageWithSoucreImageView:(UIImageView *)imageView{
CGRect foreCropRect = self.willCropRect;
CGRect soucreRect = imageView.frame;
UIImage *soucreImage = imageView.image;
//缩放比例
float zoomScale = [[imageView.layer valueForKeyPath:@"transform.scale.x"] floatValue];
//计算 要裁剪图片的大小
CGSize cropSize = CGSizeMake((foreCropRect.size.width)/zoomScale, (foreCropRect.size.height)/zoomScale);
//计算 裁剪图片的原点
CGPoint cropViewOrigin = CGPointMake((foreCropRect.origin.x - soucreRect.origin.x)/zoomScale,
(foreCropRect.origin.y - soucreRect.origin.y)/zoomScale);
//向上取整
if((NSInteger)cropSize.width % 2 == 1)
{
cropSize.width = ceil(cropSize.width);
}
if((NSInteger)cropSize.height % 2 == 1)
{
cropSize.height = ceil(cropSize.height);
}
float _imageScale = soucreImage.size.width / self.cropAreaWidth;
CGFloat imgRate = KScreenWidth/self.cropAreaWidth;
//修正偏移量 得到最终的
CGRect CropImageRect = CGRectMake((NSInteger)(cropViewOrigin.x)*_imageScale/imgRate ,(NSInteger)( cropViewOrigin.y)*_imageScale/imgRate, (NSInteger)(cropSize.width)*_imageScale/imgRate,(NSInteger)(cropSize.height)*_imageScale/imgRate);
//旋转的角度 获取绕z轴 旋转的角度 -- 也就是当前平面旋转的角度
float rotate = [[imageView.layer valueForKeyPath:@"transform.rotation.z"] floatValue];
NSLog(@"旋转角度 == %f",rotate * 180/M_PI );
//根据旋转的角度得到新的图片
UIImage *rotInputImage = [soucreImage imageRotatedByRadians:rotate];
CGImageRef tmp = CGImageCreateWithImageInRect([rotInputImage CGImage], CropImageRect);
UIImage *resultImage = [UIImage imageWithCGImage:tmp scale:soucreImage.scale orientation:soucreImage.imageOrientation];
if (!resultImage) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"您剪切的区域无效，请重新剪切" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];
[alert show];
return nil;
}
CGRect imageRect = CGRectZero;
imageRect.size = resultImage.size;
UIBezierPath *cropedPath;
//设置为YES 不透明，节省性能
UIGraphicsBeginImageContextWithOptions(imageRect.size, YES,1);
{
//[[UIColor blackColor] setFill];
UIRectFill(imageRect);
[[UIColor whiteColor] setFill];
//修改
cropedPath = [UIBezierPath bezierPathWithRect:imageRect];
[cropedPath fill];
}
UIImage *maskImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//设置为YES 不透明，节省性能
//1 裁剪尺寸原比例 设置为0或者UIScreen.mainScreen.scale 或随屏幕分辨率放大尺寸
UIGraphicsBeginImageContextWithOptions(imageRect.size,YES,1);
{
CGContextClipToMask(UIGraphicsGetCurrentContext(), imageRect, maskImage.CGImage);
[resultImage drawAtPoint:CGPointZero];
}
UIImage *maskResultImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return maskResultImage;
}
扣扣：807224386
E-mail: julylions@163.com
博客：https://www.jianshu.com/p/1298428f5848
DBCropImage is available under the MIT license. See the LICENSE file for more info.