- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"TableViewCell" forIndexPath:indexPath];
cell.tag = indexPath.row;
//cell.imageView.image = nil;
// Rounded Rect for cell image
CALayer *cellImageLayer = cell.imageView.layer;
[cellImageLayer setCornerRadius:25];
[cellImageLayer setMasksToBounds:YES];
[self getImages];
[self storeImages];
UIImage *image =_ResimSonHali[indexPath.row];
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH,0);
dispatch_async(queue,^(void) {
if (image) {
dispatch_async(dispatch_get_main_queue(),^{
if (cell.tag == indexPath.row) {
CGSize itemSize = CGSizeMake(50,50);
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect = CGRectMake(0.0,0.0,itemSize.width,itemSize.height);
[image drawInRect:imageRect];
// cell.ThumbImage.image = image1;
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[cell setNeedsLayout];
}
});
}
});
cell.TitleLabel.text = _TarifAdi[indexPath.row];
return cell;
}
-(void)getImages
{
NSMutableArray *fuckingArrayYemek = [[NSMutableArray alloc] init];
for (int i=0; i<[_ResimAdiBase count]; i++)
{
NSString *testString=_ResimAdiBase[i];
NSArray *ImageNames = [testString componentsSeparatedByString:@"."];
[self cacheImage: _ResimAdi[i] : ImageNames[0] ];
[fuckingArrayYemek addObject:ImageNames[0]];
}
_ResimSonAdi = fuckingArrayYemek;
}
-(void) storeImages
{
NSMutableArray *fuckingArrayYemekName = [[NSMutableArray alloc] init];
for (int i=0; i<[_ResimAdiBase count]; i++)
{
[fuckingArrayYemekName addObject:[self getCachedImage:_ResimSonAdi[i]]];
}
_ResimSonHali = fuckingArrayYemekName;
}
- (void) cacheImage: (NSString *) ImageURLString : (NSString *)imageName
{
NSURL *ImageURL = [NSURL URLWithString: ImageURLString];
// Generate a unique path to a resource representing the image you want
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *docDir = [paths objectAtIndex: 0];
NSString *docFile = [docDir stringByAppendingPathComponent: imageName];
// Check for file existence
if(![[NSFileManager defaultManager] fileExistsAtPath: docFile])
{
// The file doesn't exist,we should get a copy of it
// Fetch image
NSData *data = [[NSData alloc] initWithContentsOfURL: ImageURL];
UIImage *image = [[UIImage alloc] initWithData: data];
// Is it PNG or JPG/JPEG?
// Running the image representation function writes the data from the image to a file
if([ImageURLString rangeOfString: @".png" options: NSCaseInsensitiveSearch].location != NSNotFound)
{
[UIImagePNGRepresentation(image) writeToFile: docFile atomically: YES];
}
else if([ImageURLString rangeOfString: @".jpg" options: NSCaseInsensitiveSearch].location != NSNotFound ||
[ImageURLString rangeOfString: @".jpeg" options: NSCaseInsensitiveSearch].location != NSNotFound)
{
[UIImageJPEGRepresentation(image,100) writeToFile: docFile atomically: YES];
}
}
}
- (UIImage *) getCachedImage : (NSString *)imageName
{
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory,YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* cachedPath = [documentsDirectory stringByAppendingPathComponent:imageName];
UIImage *image;
// Check for a cached version
if([[NSFileManager defaultManager] fileExistsAtPath: cachedPath])
{
image = [UIImage imageWithContentsOfFile: cachedPath]; // this is the cached image
}
else
{
NSLog(@"Error getting image %@",imageName);
}
return image;
}
当我加载20个数据时,我们的表格不会滞后但是当我们尝试增加数据大小时,表格视图会滞后我们如何证明这个问题.首先我们尝试调度然后我们尝试保存图像缓存仍然我们有滞后.大约3天左右,我们处理这个问题.
解决方法
这是cacheImage()方法中的问题行,每次调用“cellForRowAtIndexPath”方法都会调用它
NSData *data = [[NSData alloc] initWithContentsOfURL: ImageURL];
因此,要解决此问题,请在dispatch_async部分下使用此行.并根据它更新您的代码.
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