NSThread * thread=[[NSThread alloc] initWithTarget:self selector:@selector(_update) object:nil];

    [NSThread detachNewThreadSelector:@selector(_update) toTarget:self withObject:nil];

    [self performSelectorInBackground:@selector(_update) withObject:nil];

    NSOperationQueue *queue=[[NSOperationQueue alloc] init];[queue addOperationWithBlock:^{for(int i=0;i<50;i++){printf("子线程\n");}}];

    //第一步开启线程池NSOperationQueue * queue=[[NSOperationQueue alloc] init];//设置并发数目[queue setMaxConcurrentOperationCount:2];//第二部创建多线程添加到线程池NSInvocationOperation * thread1=[[NSInvocationOperation alloc] initWithTarget:self selector:@selector(_update1) object:nil];NSInvocationOperation *thread2=[[NSInvocationOperation alloc] initWithTarget:self selector:@selector(_update2) object:nil];[thread1 setQueuePriority:NSOperationQueuePriorityVeryLow];[thread2 setQueuePriority:NSOperationQueuePriorityVeryHigh];[queue addOperation:thread1];[queue addOperation:thread2];

#import "UIImageView+thread.h"@implementation UIImageView(load)- (void) setImageWithUrl:(NSString *)url{[self performSelectorInBackground:@selector(_loadImage:) withObject:url];}- (void) _loadImage:(NSString *)u{@autoreleasepool {NSURL *url=[NSURL URLWithString:u];NSData *data=[NSData dataWithContentsOfURL:url];UIImage *image=[UIImage imageWithData:data];[self performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:NO];}
}

作者：杰瑞教育
出处：http://www.cnblogs.com/jerehedu/ 
本文版权归烟台杰瑞教育科技有限公司和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。