iOS多线程开发

最新推荐文章于 2025-09-07 20:08:22 发布

转载最新推荐文章于 2025-09-07 20:08:22 发布 · 59 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：https://my.oschina.net/onlysimple/blog/711589

文章标签：

#移动开发 #python

2019独角兽企业重金招聘Python工程师标准>>>

- (IBAction)begin:(id)sender {
    
    NSArray *urlArray = @[
                          @"http:/www.planetware.com/photos-large/F/france-paris-eiffel-tower.jpg",
                          @"http://adriatic-lines.com/wp-content/uploads/2015/04/canal-of-Venice.jpg",
                          @"http://algoos.com/wp-content/uploads/2015/08/ireland-02.jpg",
                          @"http://bdo.se/wp-content/uploads/2014/01/Stockholm1.jpg"
                          ];

    //第一种 GCD 调度队列
  /*  dispatch_queue_t queue = dispatch_get_global_queue(0, 0);
    dispatch_async(queue, ^{
        NSData *data1 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[0]]];
        UIImage *image1 = [[UIImage alloc]initWithData:data1];
        dispatch_async(dispatch_get_main_queue(), ^{
            self.IM1.image = image1;
        });
    });
    
    dispatch_async(queue, ^{
        NSData *data2 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[1]]];
        UIImage *image2 = [[UIImage alloc]initWithData:data2];
        dispatch_async(dispatch_get_main_queue(), ^{
            self.IM2.image = image2;
        });
    });
    
    
    dispatch_async(queue, ^{
        NSData *data3 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[2]]];
        UIImage *image3 = [[UIImage alloc]initWithData:data3];
        dispatch_async(dispatch_get_main_queue(), ^{
            self.IM3.image = image3;
        });
    });
    
    
    dispatch_async(queue, ^{
        NSData *data4 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[3]]];
        UIImage *image4 = [[UIImage alloc]initWithData:data4];
        dispatch_async(dispatch_get_main_queue(), ^{
            self.IM4.image = image4;
        });
    });*/
    
    //第二种 NSOperationQueue
  /*  NSOperationQueue *queue1 = [[NSOperationQueue alloc]init];
    
    [queue1 addOperationWithBlock:^{
        NSData *data1 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[0]]];
        UIImage *image1 = [[UIImage alloc]initWithData:data1];
        [[NSOperationQueue mainQueue]addOperationWithBlock:^{
            self.IM1.image = image1;
        }];
    }];
    
    [queue1 addOperationWithBlock:^{
        NSData *data2 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[1]]];
        UIImage *image2 = [[UIImage alloc]initWithData:data2];        [[NSOperationQueue mainQueue]addOperationWithBlock:^{
            self.IM2.image = image2;
        }];
    }];

    
    [queue1 addOperationWithBlock:^{
        NSData *data3 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[2]]];
        UIImage *image3 = [[UIImage alloc]initWithData:data3];

        [[NSOperationQueue mainQueue]addOperationWithBlock:^{
            self.IM3.image = image3;
        }];
    }];

    
    [queue1 addOperationWithBlock:^{
        NSData *data4 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[3]]];
        UIImage *image4 = [[UIImage alloc]initWithData:data4];
        [[NSOperationQueue mainQueue]addOperationWithBlock:^{
            self.IM4.image = image4;
        }];
    }];*/
    
    // 第三种  NSBlockOperation
    
    NSOperationQueue *queue3 = [[NSOperationQueue alloc]init];
    NSBlockOperation *operation1 = [NSBlockOperation blockOperationWithBlock:^{
        NSData *data1 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[0]]];
        UIImage *image1 = [[UIImage alloc]initWithData:data1];
        [[NSOperationQueue mainQueue]addOperationWithBlock:^{
            self.IM1.image = image1;
        }];
    }];
    operation1.completionBlock = ^{
       NSLog(@"Operation 1 completed");
    };
    [queue3 addOperation:operation1];
    
    NSBlockOperation *operation2 = [NSBlockOperation blockOperationWithBlock:^{
        NSData *data2 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[1]]];
        UIImage *image2 = [[UIImage alloc]initWithData:data2];        [[NSOperationQueue mainQueue]addOperationWithBlock:^{
            self.IM2.image = image2;
        }];
    }];
    operation2.completionBlock = ^{
        NSLog(@"Operation 2 completed");
    };
    [queue3 addOperation:operation2];
    
    NSBlockOperation *operation3 = [NSBlockOperation blockOperationWithBlock:^{
        NSData *data3 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[2]]];
        UIImage *image3 = [[UIImage alloc]initWithData:data3];
        
        [[NSOperationQueue mainQueue]addOperationWithBlock:^{
            self.IM3.image = image3;
        }];
    }];
    operation3.completionBlock = ^{
        NSLog(@"Operation 3 completed");
    };
    [queue3 addOperation:operation3];
    
    NSBlockOperation *operation4 = [NSBlockOperation blockOperationWithBlock:^{
        NSData *data4 = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlArray[3]]];
        UIImage *image4 = [[UIImage alloc]initWithData:data4];
        [[NSOperationQueue mainQueue]addOperationWithBlock:^{
            self.IM4.image = image4;
        }];
    }];
    
    operation4.completionBlock = ^{
        NSLog(@"Operation 4 completed");
    };
    [queue3 addOperation:operation4];
    


}

参考文档：http://www.cocoachina.com/ios/20160201/15179.html

转载于:https://my.oschina.net/onlysimple/blog/711589