NSThread详解

NSThread是OC中的多线程面向对象的一种模式,不需要手动去管理线程我们只负责创建即可,详细用法见如下代码

#import "ViewController.h"


@interface ViewController ()

@end

@implementation ViewController

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [self createNewThread1];
}

//1.alloc init 创建线程,需要手动启动线程
//线程的生命周期:当任务执行完毕之后被释放掉
-(void)createNewThread1
{
    //1.创建线程
    /*
     第一个参数:目标对象  self
     第二个参数:方法选择器 调用的方法
     第三个参数:前面调用方法需要传递的参数 nil
     */
    NSThread *threadA = [[NSThread alloc]initWithTarget:self selector:@selector(run:) object:@"ABC"];
    
    //设置属性
    threadA.name = @"线程A";
    //设置优先级  取值范围 0.0 ~ 1.0 之间 最高是1.0 默认优先级是0.5
    threadA.threadPriority = 1.0;
    
    //2.启动线程
    [threadA start];

    
//    NSThread *threadB = [[NSThread alloc]initWithTarget:self selector:@selector(run:) object:@"ABC"];
//    threadB.name = @"线程b";
//    threadB.threadPriority = 0.1;
//    [threadB start];
//    
//    NSThread *threadC = [[NSThread alloc]initWithTarget:self selector:@selector(run:) object:@"ABC"];
//    threadC.name = @"线程C";
//    [threadC start];
}

//2.分离子线程,自动启动线程
-(void)createNewThread2
{
    [NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:@"分离子线程"];
}

//3.开启一条后台线程
-(void)createNewThread3
{
    [self performSelectorInBackground:@selector(run:) withObject:@"开启后台线程"];
    
    
    
    /*
     
     NSObject 的分类,用法与上面相同
     
     @interface NSObject (NSThreadPerformAdditions)
     
     - (void)performSelectorOnMainThread:(SEL)aSelector withObject:(nullable id)arg waitUntilDone:(BOOL)wait modes:(nullable NSArray<NSString *> *)array;
     - (void)performSelectorOnMainThread:(SEL)aSelector withObject:(nullable id)arg waitUntilDone:(BOOL)wait;
     // equivalent to the first method with kCFRunLoopCommonModes
     
     - (void)performSelector:(SEL)aSelector onThread:(NSThread *)thr withObject:(nullable id)arg waitUntilDone:(BOOL)wait modes:(nullable NSArray<NSString *> *)array NS_AVAILABLE(10_5, 2_0);
     - (void)performSelector:(SEL)aSelector onThread:(NSThread *)thr withObject:(nullable id)arg waitUntilDone:(BOOL)wait NS_AVAILABLE(10_5, 2_0);
     // equivalent to the first method with kCFRunLoopCommonModes
     - (void)performSelectorInBackground:(SEL)aSelector withObject:(nullable id)arg NS_AVAILABLE(10_5, 2_0);

     */
}

-(void)run:(NSString *)param
{
//    NSLog(@"---run----%@---%@",[NSThread currentThread].name,param);
    for (NSInteger i = 0; i<10000; i++) {
        NSLog(@"%zd----%@",i,[NSThread currentThread].name);
    }
}




@end

• 阻塞线程,线程会在我们阻塞的时间之后执行

    //阻塞线程
    //[NSThread sleepForTimeInterval:2.0];
    [NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:3.0]];