#pragma mark --裁剪
- (UIImage *)handleImage:(UIImage *)originalImage withSize(CGSize)size
{? }
- (UIImage *)handleImage:(UIImage *)originalImage withSize:(CGSize )size {
CGSize originalsize = [originalImage size];
NSLog(@"高度 == %f? 寬度 == %f", originalsize.height,originalsize.width);
//原圖長|寬均小于標準長寬的,不作處理 直接返回
if (originalsize.width < size.width && originalsize.height < size.height) {
return originalImage;
}
//原圖長寬均大于標準長|寬,按比例適配
else if (originalsize.width > size.width && originalsize.height > size.height) {
CGFloat rate = 1.f;
CGFloat widthRate = originalsize.width/originalsize.height;//寬:高
CGFloat heightRate = originalsize.height/originalsize.width;//高:寬
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));//獲取圖片整體部分
}
else
{
imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(originalsize.width/2 - size.width*rate/2, 0, size.width*rate, originalsize.height));//獲取圖片整體部分
}
UIGraphicsBeginImageContext(size);//指定要繪畫圖片的大小
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(@"裁剪之后的圖片: 寬度 %f? 高度 %f",[standardImage size].width,[standardImage size].height);
UIGraphicsEndImageContext();
CGImageRelease(imageRef);
return standardImage;
}
//原圖長|寬有一項大于標準長|寬的,對大于標準的那一項進行裁剪,另一項保持不變
else if (originalsize.width > size.width || originalsize.height > size.height) {
CGImageRef imageRef = nil;
//高度大于標準高度
if (originalsize.height > size.height) {
imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(0, originalsize.height/2 - size.height/2, originalsize.width, size.height));//獲取圖片整體部分
}
else if (originalsize.width > size.width) {
imageRef = CGImageCreateWithImageInRect([originalImage CGImage], CGRectMake(originalsize.width/2 - size.width/2, 0, size.width, originalsize.height));//獲取圖片整體部分
}
UIGraphicsBeginImageContext(size);//指定要繪畫圖片的大小
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(@"裁剪之后的圖片??: 寬度 %f? 高度 %f",[standardImage size].width,[standardImage size].height);
UIGraphicsEndImageContext();
CGImageRelease(imageRef);
return standardImage;
}
//原圖為標準長寬的,不做處理
return originalImage;
}
