0829多线程
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#import "WhyViewController.h"
@interface WhyViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *indicator;
@end
@implementation WhyViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self downLoadImageUseOperationQueue];
}
#pragma mark - 下载图像方法一:使用NSOperationQueue
- (void)downLoadImageUseOperationQueue
{
NSString *url = @"http://avatar.csdn.net/2/C/D/1_totogo2010.jpg";
NSInvocationOperation *operator = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(downLoadImage:) object:url];
NSOperationQueue *queue = [[NSOperationQueue alloc]init];
[queue addOperation:operator];
}
#pragma mark - 线程任务
- (void)downLoadImage:(NSString *)urlPath
{
NSURL *url = [NSURL URLWithString:urlPath];
NSData *data = [[NSData alloc]initWithContentsOfURL:url];
UIImage *image = [[UIImage alloc]initWithData:data];
[self performSelectorOnMainThread:@selector(updateUI:) withObject:image waitUntilDone:YES];
}
#pragma mark - 更新UI
- (void)updateUI:(UIImage *)image
{
self.imageView.image = image;
}
#pragma mark - 下载图像方法二:使用GCD
- (void)downLoadImageUseGCD
{
[self.indicator startAnimating];
self.indicator.hidesWhenStopped = YES;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSURL *url = [NSURL URLWithString:@"http://avatar.csdn.net/2/C/D/1_totogo2010.jpg"];
NSData *data = [[NSData alloc]initWithContentsOfURL:url];
UIImage *image = [[UIImage alloc]initWithData:data];
if (data != nil) {
dispatch_async(dispatch_get_main_queue(), ^{
self.imageView.image = image;
[self.indicator stopAnimating];
});
}
});
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
@interface WhyViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *indicator;
@end
@implementation WhyViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self downLoadImageUseOperationQueue];
}
#pragma mark - 下载图像方法一:使用NSOperationQueue
- (void)downLoadImageUseOperationQueue
{
NSString *url = @"http://avatar.csdn.net/2/C/D/1_totogo2010.jpg";
NSInvocationOperation *operator = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(downLoadImage:) object:url];
NSOperationQueue *queue = [[NSOperationQueue alloc]init];
[queue addOperation:operator];
}
#pragma mark - 线程任务
- (void)downLoadImage:(NSString *)urlPath
{
NSURL *url = [NSURL URLWithString:urlPath];
NSData *data = [[NSData alloc]initWithContentsOfURL:url];
UIImage *image = [[UIImage alloc]initWithData:data];
[self performSelectorOnMainThread:@selector(updateUI:) withObject:image waitUntilDone:YES];
}
#pragma mark - 更新UI
- (void)updateUI:(UIImage *)image
{
self.imageView.image = image;
}
#pragma mark - 下载图像方法二:使用GCD
- (void)downLoadImageUseGCD
{
[self.indicator startAnimating];
self.indicator.hidesWhenStopped = YES;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSURL *url = [NSURL URLWithString:@"http://avatar.csdn.net/2/C/D/1_totogo2010.jpg"];
NSData *data = [[NSData alloc]initWithContentsOfURL:url];
UIImage *image = [[UIImage alloc]initWithData:data];
if (data != nil) {
dispatch_async(dispatch_get_main_queue(), ^{
self.imageView.image = image;
[self.indicator stopAnimating];
});
}
});
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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