学习：NSThread的使用

本文主要是介绍学习：NSThread的使用，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

学习目的：NSThread的使用

功能：

1）：主线程，不做任何事情，如果做事，就会先执行，然后其他事件排后执行，这样导致界面会等待主线程事件完成后，才做其他的响应事件。

（这不是我们的目的，我们的目的是：一边一个事件执行中，一边其他界面的控件能去做事，而不是界面卡住状态！）

2）：辅助线程1：申明，然后初始化，然后start，三步完成，停止，可以直接设置一个中间变量来停止，然后cancel，和nil就可以了。

当然：在初始化的时候，要调用你写的函数。

H文件

<pre name="code" class="objc">#import <Cocoa/Cocoa.h>@interface EDUCATIONDocument : NSPersistentDocument
{NSThread *thread_second;
}
@property (assign) IBOutlet NSTextField *m_ET_input;@property (assign) IBOutlet NSTextField *m_LB_GetValue;@property (assign) IBOutlet NSTextField *m_LB_Thread1_Show;@end

M文件

//
//  EDUCATIONDocument.m
//  Learn_NSThread
//
//  Created by DMD on 31/7/14.
//  Copyright (c) 2014 EDUCATION. All rights reserved.
//#import "EDUCATIONDocument.h"static bool g_thread1_run_flag =false;
static int g_count=0;
@implementation EDUCATIONDocument@synthesize m_LB_Thread1_Show;
@synthesize m_LB_GetValue;
@synthesize m_ET_input;- (id)init
{self = [super init];if (self) {// Add your subclass-specific initialization here.}return self;
}- (NSString *)windowNibName
{// Override returning the nib file name of the document// If you need to use a subclass of NSWindowController or if your document supports multiple NSWindowControllers, you should remove this method and override -makeWindowControllers instead.return @"EDUCATIONDocument";
}- (void)windowControllerDidLoadNib:(NSWindowController *)aController
{[super windowControllerDidLoadNib:aController];// Add any code here that needs to be executed once the windowController has loaded the document's window.
}+ (BOOL)autosavesInPlace
{return YES;
}- (IBAction)OnBT_Start_Thread1:(id)sender
{[self do_thread1];
}- (IBAction)OnBT_Stop_Thread1:(id)sender
{g_thread1_run_flag = false;[thread_second cancel];thread_second = nil;
}- (IBAction)OnBT_Now_Station:(id)sender
{m_LB_GetValue.stringValue = [NSString stringWithFormat:@"g_thread1_run_flag = %d,g_ount = %d",g_thread1_run_flag,g_count];
}- (IBAction)OnBT_GetNumber:(id)sender
{m_LB_GetValue.stringValue = m_ET_input.stringValue;
}
// Show Top 1 ++
-(void)closeModalWindow:(id)sender
{[[NSApplication sharedApplication] stopModal];
}- (void)windowWillClose:(NSNotification *)notification
{[self performSelectorOnMainThread:@selector(closeModalWindow:) withObject:nil waitUntilDone:NO];
}
// Show Top 1 ---(void)do_thread1
{//主线程：不需要申明变量[self performSelectorOnMainThread:@selector(thread_function_main) withObject:self waitUntilDone:YES];//次线程，需要申明thread_second = [[NSThread alloc] initWithTarget:self selector:@selector(thread_function_second) object:nil];//次线程开始g_thread1_run_flag = true;[thread_second start];//和次线程一起做的事情
//    [NSThread detachNewThreadSelector:@selector(threadFunc3) toTarget:self withObject:nil];
}-(void)thread_function_main
{
}-(void)thread_function_second
{if(false == g_thread1_run_flag){return ;}int i=0;int j=0;int max =100;for (i=1; i<max; i++){for (j=1; j<max; j++){g_count=i*j;if (false == g_thread1_run_flag){i=max;break;}else{[NSThread sleepForTimeInterval:0.02f];// ＝ sleep(20 ms)self.m_LB_Thread1_Show.stringValue = [NSString stringWithFormat:@"%d x %d  = %d",i,j,g_count];}}}}
//当关闭窗口的时候，执行的事件，属于协议函数 ［也可以不用在H里面申明］
- (BOOL)windowShouldClose:(id)window
{NSAlert* alert = [[NSAlert alloc] init];[alert setAlertStyle:NSInformationalAlertStyle];[alert setMessageText:@"Are you sure you want to quit?"];[alert addButtonWithTitle:@"Yes"];[alert addButtonWithTitle:@"No"];NSInteger result = [alert runModal];if (result == NSAlertFirstButtonReturn){[self OnBT_Stop_Thread1:nil];[alert release];return YES;}[alert release];return NO;
}
//当关闭窗口的时候 ［也可以不用在H里面申明］
- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication
{return YES;
}@end

运行效果

测试OK！

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