Q:Async Image Loading Performance |
Q:异步图像加载性能 |
I am loading images in UITableViewCell receiving from url using below code, everything is working fine but the image load very slow in UITableViewCell and if i think as a user, it is not acceptable.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [checkData count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSInteger i =indexPath.row;
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
UIImageView propertyImage = (UIImageView *)[cell viewWithTag:10];
NSString *test = [[checkData objectAtIndex:i]valueForKey:@"image"];
CGRect frame=propertyImage.bounds;
AsyncImageView asyImage=[[AsyncImageView alloc] initWithFrame:frame];
[asyImage setImage:[UIImage imageNamed:@"loading.png"]];
self.urlForTesting=[NSURL URLWithString:test];
[asyImage loadImageFromURL:self.urlForTesting];
asyImage.imageURL =self.urlForTesting;
asyImage.contentMode = UIViewContentModeScaleToFill;
asyImage.layer.masksToBounds=YES;
[propertyImage addSubview:asyImage];
return cell;
}
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我加载图像UITableViewCell接收从URL使用下面的代码,一切工作正常,但图像加载UITableViewCell非常缓慢和如果我认为作为一个用户,这是不可接受的。
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [checkData count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSInteger i =indexPath.row;
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
UIImageView propertyImage = (UIImageView *)[cell viewWithTag:10];
NSString *test = [[checkData objectAtIndex:i]valueForKey:@"image"];
CGRect frame=propertyImage.bounds;
AsyncImageView asyImage=[[AsyncImageView alloc] initWithFrame:frame];
[asyImage setImage:[UIImage imageNamed:@"loading.png"]];
self.urlForTesting=[NSURL URLWithString:test];
[asyImage loadImageFromURL:self.urlForTesting];
asyImage.imageURL =self.urlForTesting;
asyImage.contentMode = UIViewContentModeScaleToFill;
asyImage.layer.masksToBounds=YES;
[propertyImage addSubview:asyImage];
return cell;
}
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answer1: |
回答1: |
Use AFNetworking Class & add additional two file to download from github "UIImageView+AFNetworking" and import in your project. then after add this code from "cellForRowAtIndexPath"
// Fetch Image from URL
NSURL *url = [NSURL URLWithString:[[checkData objectAtIndex:i]valueForKey:@"image"]];
[objWinner.actWinner startAnimating];
[objWinner.actWinner setHidden:NO];
NSURLRequest *req = [NSURLRequest requestWithURL:url];
[objWinner.imgwinner setImageWithURLRequest:req placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image){
[objWinner.actWinner stopAnimating]; // this is Activityindicator
[objWinner.actWinner setHidden:YES];
objWinner.imgwinner.image = image;
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error){
}];
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使用AFNetworking类&;添加额外的两个文件从GitHub”UIImageView + AFNetworking”和你的项目导入下载。然后添加此代码从“cellForRowAtIndexPath”
// Fetch Image from URL
NSURL *url = [NSURL URLWithString:[[checkData objectAtIndex:i]valueForKey:@"image"]];
[objWinner.actWinner startAnimating];
[objWinner.actWinner setHidden:NO];
NSURLRequest *req = [NSURLRequest requestWithURL:url];
[objWinner.imgwinner setImageWithURLRequest:req placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image){
[objWinner.actWinner stopAnimating]; // this is Activityindicator
[objWinner.actWinner setHidden:YES];
objWinner.imgwinner.image = image;
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error){
}];
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ios
objective-c
iphone
xcode
uitableview
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