OC 中从图片上截图一部分内容
//截取部分图片并生成新图片
CGImageRef sourceImageRef = [image CGImage];
CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, dianRect);
UIImage *newImage = [UIImage imageWithCGImage:newImageRef scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp];
Swift 中从图片上截图一部分内容
let sourceImageRef: CGImageRef = image.CGImage!
let newCGImage = CGImageCreateWithImageInRect(sourceImageRef, CGRectMake(0, 0, image.size.width, imageViewHeight))!
let newImage = UIImage.init(CGImage: newCGImage)
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