多线程的四种创建方式－－前两种不常用

- (void)viewDidLoad {

[super viewDidLoad];

//1.Datach 方式，隐式创建

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

//2.NSObject的perform方法，隐式创建

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

//3.显示创建

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

//给线程name赋值

// thread.name =@"thread_name";

//在线程创建之前设置栈空间才有效

// thread.stackSize =100;

//线程全局数据 readOnly

// [thread.threadDictionary setObject:@"value1" forKey:@"key1"];

//开启线程

// [thread start];

方法4需要子类化一个子类

　　　　- (id)initWithTarget:(id)target selector:(SEL)selector object:(id)argument{

　　　　if (self =[super initWithTarget:target selector:selector object:argument]) {

　　 _target =target;

　　 _sel =selector;

　　　　}

　　　　 return self;

　　　　　　}

- (void)main{

if (_target) {

//父类的main方法中，_target 会掉用_sel

[_target performSelector:_sel withObject:nil];

}

}

//4.子类NSThread ，重写main方法

Thread *thread1 =[[Thread alloc]initWithTarget:self selector:@selector(detachMethod) object:nil];

[thread1 start];

}

- (void)detachMethod{

//是否是主线程

NSLog(@"%d",[NSThread isMainThread]);

//获取当前线程，打印name

NSLog(@"%@",[[NSThread currentThread]name]);

}