iOS NSThreadGCD 线程与队列（一）

//
//  NSThreadVController.m
//  ZM_NSThreadGCD
//
//  Created by ZM on 2015/2/9.
//  Copyright © 2015 年 ZM. All rights reserved.
//

#import "NSThreadVController.h"

@interface NSThreadVController ()
{
    UILabel *my_label;
}
@end

@implementation NSThreadVController

- ( void )viewDidLoad
{
    [ super viewDidLoad ];
    self . title = @"NSThreadVC" ;

    my_label = [[ UILabel alloc ] initWithFrame : CGRectMake ( 80 , 80 , 150 , 60 )];
    my_label . backgroundColor =[ UIColor cyanColor ];
    my_label . text = @" 幸福每一天 " ;
    my_label . font =[ UIFont systemFontOfSize : 15 ];
    my_label . textAlignment = NSTextAlignmentCenter ;
    [ self . view addSubview : my_label ];
   
    [ self addBtnTitle : @" 开辟分线程 " frame : CGRectMake ( 10 , 200 , 200 , 35 ) Tag : 111 ];

}


- ( void )myBtnClick:( UIButton *)Btn{
   
    NSDictionary *params = @{ @"key1" : @"value1" ,
                             @"key2" : @"value2" } ;
    // 开辟分线程
    [ NSThread detachNewThreadSelector : @selector (newThread:) toTarget : self withObject :params];
}


// 分线程
-( void )newThread:( NSMutableDictionary *)dic
{
    // 创建线程
    // 判断 BOOL 量
    NSThread *thread = [ NSThread currentThread ];
    BOOL isMainThread = [thread isMainThread ];
   
    NSLog ( @"---> thread = %d" ,isMainThread);
    NSLog ( @"---> dic = %@ \n " ,dic);

    // 创建 主线程
    // 去网络请求获取数据 请求完成 必须要回到主线程刷新数据
    [ self performSelectorOnMainThread : @selector (mainThread:) withObject : @" 在主线程刷新数据 " waitUntilDone : YES ];
   
   
//    //1. 直接在开辟的线程中可以刷新数据
//    my_label.text = [dic objectForKey:@"key1"];
//
//    //2. 无论在分线程或者主线程中 再开辟一个分线程：都不能刷新数据
//    [NSThread detachNewThreadSelector:@selector(againNewThread_Two:) toTarget:self withObject:@{@"labelText": @"label"} ];
   
   
}
// 主线程
-( void )mainThread:( NSString *)str
{
    //1. 主线程刷新数据
    NSLog ( @"---> str: %@" ,str);
    my_label . text = str;
   
   
    //2. 无论在分线程或者主线程中 再开辟一个分线程：都不能刷新数据
//    [NSThread detachNewThreadSelector:@selector(againNewThread_Two:) toTarget:self withObject:@{@"labelText": @"label"} ];
   
}

// 在线程中：再开辟一个分线程
-( void )againNewThread_Two:( NSMutableDictionary *)dic
{
    NSString *str= [dic objectForKey : @"label" ];
    NSLog ( @"---> my_label.text: %@ \n " ,str);
    my_label . text = str;
}


@end