我目前正在使用的代码不是模糊的,但是只是切掉了一部分,如果我尝试在线使用其他代码,它也会切掉一部分,并且也变得很模糊。我需要做什么,图片是512x512,试图将其降低到100x100,并且是jpg。
这是我现在使用的代码:
//setting up each cell
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
CollectionGridCell *myCell = [collectionView
dequeueReusableCellWithReuseIdentifier:@"GridCell"
forIndexPath:indexPath];
long row = [indexPath row];
NSURL *baseUrl = [NSURL URLWithString:@"http://example.com/"];
NSString *imageItemName = [homeImages objectAtIndex:row];
NSURL *url = [NSURL URLWithString:imageItemName relativeToURL:baseUrl];
// NSURL *url = /* prepare a url... see note below */
[myCell.homeImage setImageWithURL:url
placeholderImage:[UIImage imageNamed:@"menuButton.png"]
completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
// inspect cacheType here to make sure it's cached as you want it
myCell.homeImage.image = [self resizeImage:image newSize:CGSizeMake(75,75)];
}];
return myCell;
}
- (UIImage *)resizeImage:(UIImage*)image newSize:(CGSize)newSize {
CGRect newRect = CGRectIntegral(CGRectMake(0, 0, newSize.width, newSize.height));
CGImageRef imageRef = image.CGImage;
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
// Set the quality level to use when rescaling
CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
CGAffineTransform flipVertical = CGAffineTransformMake(1, 0, 0, -1, 0, newSize.height);
CGContextConcatCTM(context, flipVertical);
// Draw into the context; this scales the image
CGContextDrawImage(context, newRect, imageRef);
// Get the resized image from the context and a UIImage
CGImageRef newImageRef = CGBitmapContextCreateImage(context);
UIImage *newImage = [UIImage imageWithCGImage:newImageRef];
CGImageRelease(newImageRef);
UIGraphicsEndImageContext();
return newImage;
}
更新:到目前为止,我什至尝试过以下任何一种方法,都导致中间出现错误。我是否需要在代码中指定其他内容,是否有某些内容可以称呼中间部分?
这是我的网格单元.h文件:
#import <UIKit/UIKit.h>
@interface CollectionGridCell : UICollectionViewCell
@property (weak, nonatomic) IBOutlet UIImageView *homeImage;
@end
这是我的网格单元.m文件:
#import "CollectionGridCell.h"
@implementation CollectionGridCell
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
@end
无需调整图像大小。只需将以下属性设置为您的图像视图即可。
[myCell.homeImage setImageWithURL:url
placeholderImage:[UIImage imageNamed:@"menuButton.png"]
completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
// inspect cacheType here to make sure it's cached as you want it
myCell.homeImage.image = image;
myCell.homeImage.contentMode = UIViewContentModeScaleAspectFit;
}];
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