我有这个相对简单的辅助方法:
- (float)imageHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
float imageWidth = [[self.widthArray objectAtIndex:indexPath.row] floatValue];
float ratio = screenWidth/imageWidth;
float imageHeight = ratio * [[self.heightArray objectAtIndex:indexPath.row] floatValue];
return imageHeight;
}
- (UIImage *)imageWithImage:(UIImage *)image forRowAtIndexPath:(NSIndexPath *)indexPath
{
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat newWidth = screenRect.size.width;
CGFloat newHeight = [self imageHeightForRowAtIndexPath:indexPath.row];
UIGraphicsBeginImageContext(CGSizeMake(newWidth, newHeight ));
[image drawInRect:CGRectMake(0, 0, newWidth, newHeight)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Implicit conversion from 'NSInteger' to 'NSIndexPath' is disallowed最佳答案
您有2种方法:
- (float)imageHeightForRowAtIndexPath:(NSIndexPath *)indexPath - (UIImage *)imageWithImage:(UIImage *)image forRowAtIndexPath:(NSIndexPath *)indexPath NSIndexPath *参数。imageWithImage:forRowAtIndexPath:中，您正在调用imageHeightForRowAtIndexPath::[self imageHeightForRowAtIndexPath:indexPath.row]
row(一个indexPath)中获取NSInteger，并尝试将其传递给imageHeightForRowAtIndexPath::，后者需要一个NSIndexPath *。NSIndexPath *并且知道您正在提供NSInteger。CGFloat newHeight = [self imageHeightForRowAtIndexPath:indexPath];
https://stackoverflow.com/questions/27766339/
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