多线程：线程的属性

////  ViewController.m//  05-线程属性////  Created by gzxzmac on 16/1/28.//  Copyright © 2016年 gzxzmac. All rights reserved.//#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {    NSThread *thread = [NSThread currentThread];    NSLog(@"%@",[NSThread currentThread]);    // 输出栈区大小    NSLog(@"%zd",[thread stackSize] / 1024);    NSLog(@"主线程优先级 %f",thread.threadPriority);//    return;    NSThread *thread0 = [[NSThread alloc]initWithTarget:self selector:@selector(demo) object:nil];    // 设置线程的名字  设置线程的名字，在调试的时候可以直接定位到哪个线程出了问题    // 大项目有专有的线程 -> 服务端    thread0.name = @"thread 1";    // 设置线程栈区大小    // 设置栈区大小，必须是4的倍数.如果不是4的倍数，会默认512 kb.    // 栈区大小不要设置太小，太小程序就会崩了.最好是不要修改    thread0.stackSize = 512 * 1024;    // 线程优先级 优先级必须是0.0 - 1.0 ，1.0是优先级最高    // 优先级不是先执行完再执行其他，而是cpu 调度的频率会高点    // 最好不要修改优先级    thread0.threadPriority = 0.99;    [thread0 start];    [NSThread detachNewThreadSelector:@selector(demo) toTarget:self withObject:nil];}- (void)demo {    NSThread *thread = [NSThread currentThread];    // 输出栈区大小    NSLog(@"%zd",[thread stackSize] / 1024);    NSLog(@"子线程优先级 %f",thread.threadPriority);    for (int i = 0; i < 20; ++i) {        NSLog(@"%@ %d",[NSThread currentThread],i);    }}@end