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+ (UIImage *)handleImage:(UIImage *)originalImage withSize:(CGSize)size{ CGSize originalsize = [originalImage size]; NSLog(@"改变前图片的宽度为%f,图片的高度为%f",originalsize.width,originalsize.height); //原图长宽均小于标准长宽的，不作处理返回原图 if (originalsize.width<size.width && originalsize.height<size.height) { return originalImage; } //原图长宽均大于标准长宽的，按比例缩小至最大适应值 else if(originalsize.width>size.width && originalsize.height>size.height) { CGFloat rate = 1.0; CGFloat widthRate = originalsize.width/size.width; CGFloat heightRate = originalsize.height/size.height; rate = widthRate>heightRate?heightRate:widthRate; CGImageRef imageRef = nil; if (heightRate>widthRate) { imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(0, originalsize.height/2-size.height*rate/2, originalsize.width, size.height*rate));//获取图片整体部分 } else { imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(originalsize.width/2-size.width*rate/2, 0, size.width*rate, originalsize.height));//获取图片整体部分 } UIGraphicsBeginImageContext(size);//指定要绘画图片的大小 CGContextRef con = UIGraphicsGetCurrentContext(); CGContextTranslateCTM(con, 0.0, size.height); CGContextScaleCTM(con, 1.0, -1.0); CGContextDrawImage(con, CGRectMake(0, 0, size.width, size.height), imageRef); UIImage *standardImage = UIGraphicsGetImageFromCurrentImageContext(); NSLog(@"改变后图片的宽度为%f,图片的高度为%f",[standardImage size].width,[standardImage size].height); UIGraphicsEndImageContext(); CGImageRelease(imageRef); return standardImage; } //原图长宽有一项大于标准长宽的，对大于标准的那一项进行裁剪，另一项保持不变 else if(originalsize.height>size.height || originalsize.width>size.width) { CGImageRef imageRef = nil; if(originalsize.height>size.height) { imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(0, originalsize.height/2-size.height/2, originalsize.width, size.height));//获取图片整体部分 } else if (originalsize.width>size.width) { imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(originalsize.width/2-size.width/2, 0, size.width, originalsize.height));//获取图片整体部分 } UIGraphicsBeginImageContext(size);//指定要绘画图片的大小 CGContextRef con = UIGraphicsGetCurrentContext(); CGContextTranslateCTM(con, 0.0, size.height); CGContextScaleCTM(con, 1.0, -1.0); CGContextDrawImage(con, CGRectMake(0, 0, size.width, size.height), imageRef); UIImage *standardImage = UIGraphicsGetImageFromCurrentImageContext(); NSLog(@"改变后图片的宽度为%f,图片的高度为%f",[standardImage size].width,[standardImage size].height); UIGraphicsEndImageContext(); CGImageRelease(imageRef); return standardImage; } //原图为标准长宽的，不做处理 else { return originalImage; }} |
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原文地址：http://www.cnblogs.com/Camier-myNiuer/p/4685734.html
