NSThread 详解

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第一、iOS主线程专门用来更新显示UI界面、处理用户触摸事件的，所以不能阻塞主线程，否则带来极坏的用户体验。

一般的解决方案就是将那些耗时的操作放到另外一个线程中去执行。

    NSThread *red=[NSThread currentThread]; //获取当前线程

NSThread *mainThread=[NSThread mainThread]; //获取主线程

 第二、NSThread的创建

1. - (id)initWithTarget:(id)target selector:(SEL)selector object:(id)argument; 

argument:传输给target的唯一参数，也可以是nil

sample:

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

-(void)timerThread
{
    NSTimer *timer=[NSTimer timerWithTimeInterval:0.5 target:self selector:@selector(timeSchedule) userInfo:nil repeats:YES];
    NSRunLoop *runLoop=[NSRunLoop currentRunLoop];
    [runLoop addTimer:timer forMode:NSDefaultRunLoopMode];
    
    while ([runLoop runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]);
}
-(void)timeSchedule
{
    num++;
    NSLog(@"now the number is %d",num);
}

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

会隐式地创建一条新线程，并且在这条线程上调用self的timerThread方法

3.detachNewThreadSelector 创建线程

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

4. 停止当前线程的执行

[NSThread exit];

5. 暂停当前线程几秒

  [NSThread sleepForTimeInterval:4];
6. 在主线程上执行

 [self performSelectorOnMainThread:@selector(lastResult) withObject:nil waitUntilDone:YES];

7.在指定线程上执行操作

_thread=[[NSThreadalloc] initWithTarget:selfselector:@selector(timerThread)object:nil];

        [_thread start];

        [selfperformSelector:@selector(lastResult)onThread:_threadwithObject:nilwaitUntilDone:YES];

线程交互sample：

http://download.csdn.net/detail/ycxmartin111111/7351381

NSThread 详解,布布扣,bubuko.com

NSThread 详解

标签：style   blog   class   code   c   tar   

原文地址：http://blog.csdn.net/richard_rufeng/article/details/25886483