IOS之NSThread
初始化:
1.动态方法
- (id)initWithTarget:(id)target selector:(SEL)selector object:(id)argument; // 初始化线程 NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(run) object:nil]; // 设置线程的优先级(0.0 - 1.0,1.0最高级) thread.threadPriority = 1; // 开启线程 [thread start];
2.静态方法
+ (void)detachNewThreadSelector:(SEL)selector toTarget:(id)target withObject:(id)argument; [NSThread detachNewThreadSelector:@selector(run) toTarget:self withObject:nil]; // 调用完毕后,会马上创建并开启新线程
3.隐式创建线程
[self performSelectorInBackground:@selector(run) withObject:nil];
获取当前线程
NSThread *current = [NSThread currentThread];
获取主线程
NSThread *main = [NSThread mainThread];
暂停当前线程
// 暂停2s [NSThread sleepForTimeInterval:2]; // 或者 NSDate *date = [NSDate dateWithTimeInterval:2 sinceDate:[NSDate date]]; [NSThread sleepUntilDate:date];
线程间的通信
1.在指定线程上执行操作
[self performSelector:@selector(run) onThread:thread withObject:nil waitUntilDone:YES];
2.在主线程上执行操作
[self performSelectorOnMainThread:@selector(run) withObject:nil waitUntilDone:YES];
3.在当前线程执行操作
[self performSelector:@selector(run) withObject:nil];
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