@NSThread的使用
1.显示调用的类为NSThread有两种直接创建方式:
- (id)initWithTarget:(id)target selector:(SEL)selector object:(id)argument(手动开启)
+ (void)detachNewThreadSelector:(SEL)aSelector toTarget:(id)aTarget withObject:(id)anArgument(自动开启)
1、[NSThread detachNewThreadSelector:@selector(doSomething:) toTarget:self withObject:nil];
2、NSThread* myThread = [[NSThread alloc] initWithTarget:self
selector:@selector(doSomething:)
object:nil];
[myThread start];
2. 不显式创建线程的方法:
通过NSObject的Category方法调用:
- (void)performSelectorOnMainThread:(SEL)aSelector withObject:(id)arg waitUntilDone:(BOOL)wait; //在主线程中运行方法,wait表示是否阻塞这个方法的调用,如果为YES则等待主线程中运行方法结束。一般可用于在子线程中调用UI方法。
*- (void)performSelector:(SEL)aSelector onThread:(NSThread )thread withObject:(id)arg waitUntilDone:(BOOL)wait; //在指定线程中执行,但该线程必须具备run loop。**
- (void)performSelectorInBackground:(SEL)aSelector withObject:(id)arg; //产生新线程。
3.NSThread的其它一些常用的方法
*1. + (NSThread )currentThread; //获得当前线程**
2. + (void)sleepForTimeInterval:(NSTimeInterval)ti; //线程休眠
*3. + (NSThread )mainThread; //主线程,亦即UI线程了**
4. - (BOOL)isMainThread; + (BOOL)isMainThread; //当前线程是否主线程
5. - (BOOL)isExecuting; //线程是否正在运行
6. - (BOOL)isFinished; //线程是否已结束
7.- (void)cancel // 终止线程循环
8.- (void)start // 开启线程循环