NSThread

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#import "ViewController.h"   @interface ViewController () {     NSThread *thread1;     NSThread *thread2;     UIButton *btn;   }  @end   @implementation ViewController   - (void)viewDidLoad {     [super viewDidLoad];      btn=[UIButton buttonWithType:UIButtonTypeCustom];     btn.frame=CGRectMake(30, 30, 50, 50);     [btn setTitle:@"按钮" forState:UIControlStateNormal];     btn.backgroundColor=[UIColor greenColor];     [self.view addSubview:btn];     //线程创建 主要有两种方法      thread1=[[NSThread alloc] initWithTarget:self selector:@selector(threadfun1) object:nil];      [thread1 start];//此方法创建需要手动启动     //此方法自动启动线程方法      [NSThread detachNewThreadSelector:@selector(threadfun2) toTarget:self withObject:nil];   } -(void)threadfun1 {     NSLog(@"thread1");     //调用主线程更新     [self performSelectorOnMainThread:@selector(upbutton) withObject:nil waitUntilDone:NO];      } -(void)upbutton {     [btn setTitle:@"123" forState:UIControlStateNormal];     [self performSelector:@selector(threadtothread) withObject:nil];       } -(void)threadtothread {     NSLog(@"threadtothread"); } -(void)threadfun2 {     NSLog(@"thread2"); }   - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning];     // Dispose of any resources that can be recreated. }   @end