Objective-C中的多线程之NSThread
使用NSThread有三种创建进程的方式:
1) 创建一个新的进程，需要运行start才能启动
NSThread *newThread = [NSThread alloc]initWithTarget:<#(nonnull id)#> selector:<#(nonnull SEL)#> object:<#(nullable id)#>];
例如:NSThread *threadA = [[NSThread alloc]initWithTarget:self selector:@selector(run:) object:@"PasswingA"];
[threadA start]
2) 创建一个进程，可以直接启动，无需运行start
[NSThread detachNewThreadSelector:<#(nonnull SEL)#> toTarget:<#(nonnull id)#> withObject:<#(nullable id)#>];
例如:[NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:@"PasswingC"];
3) 后台运行的进程
[self performSelectorInBackground:<#(nonnull SEL)#> withObject:<#(nullable id)#>];
例如:[self performSelectorInBackground:@selector(run:) withObject:@"PasswingD"];
#import "ViewController.h"
@interface ViewController ()
- (IBAction)createThreadA:(UIButton *)sender;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)run:(NSString *)param {
NSThread *newThread = [NSThread currentThread];
for(int i = 0; i < 10; i++){
NSLog(@"The new Thread is : %@, Param: is %@", newThread, param);
}
}
- (IBAction)createThreadA:(UIButton *)sender {
//获取当前线程
NSThread *current = [NSThread currentThread];
NSLog(@"Current thread is: %@", current);
//获取主线程
NSThread *main = [NSThread mainThread];
NSLog(@"Main thread is %@", main);
if([sender.currentTitle isEqualToString:@"创建线程A"]){
NSLog(@"This is button A");
//创建一个新的线程A
NSThread *threadA = [[NSThread alloc]initWithTarget:self selector:@selector(run:) object:@"PasswingA"];
threadA.name = @"Thread A";
[threadA start];
}
if([sender.currentTitle isEqualToString:@"创建线程B"]){
NSLog(@"This is button B");
//创建一个新的线程B
NSThread *threadB = [[NSThread alloc]initWithTarget:self selector:@selector(run:) object:@"PasswringB"];
threadB.name = @"Thread B";
[threadB start];
}
if([sender.currentTitle isEqualToString:@"创建线程C"]){
NSLog(@"This is button C");
//创建一个新的线程C
[NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:@"PasswingC"];
}
if([sender.currentTitle isEqualToString:@"创建线程D"]){
NSLog(@"This is button D");
//创建一个新的线程D
[self performSelectorInBackground:@selector(run:) withObject:@"PasswingD"];
}
}
@end生成的log数据如下:
2018-03-25 21:41:49.313867+0800 TOCThreadc[229:5350532] [MC] Lazy loading NSBundle MobileCoreServices.framework
2018-03-25 21:41:49.315489+0800 TOCThreadc[229:5350532] [MC] Loaded MobileCoreServices.framework
2018-03-25 21:42:50.102034+0800 TOCThreadc[229:5350532] Current thread is:
2018-03-25 21:42:50.102395+0800 TOCThreadc[229:5350532] Main thread is
2018-03-25 21:42:50.102600+0800 TOCThreadc[229:5350532] This is button A
2018-03-25 21:42:50.103854+0800 TOCThreadc[229:5354269] The new Thread is :
2018-03-25 21:42:50.104431+0800 TOCThreadc[229:5354269] The new Thread is :
2018-03-25 21:42:50.105203+0800 TOCThreadc[229:5354269] The new Thread is :
2018-03-25 21:42:50.105489+0800 TOCThreadc[229:5354269] The new Thread is :
2018-03-25 21:42:50.106255+0800 TOCThreadc[229:5354269] The new Thread is :
2018-03-25 21:42:50.107416+0800 TOCThreadc[229:5354269] The new Thread is :
2018-03-25 21:42:50.107658+0800 TOCThreadc[229:5354269] The new Thread is :
2018-03-25 21:42:50.108121+0800 TOCThreadc[229:5354269] The new Thread is :
2018-03-25 21:42:50.108519+0800 TOCThreadc[229:5354269] The new Thread is :
2018-03-25 21:42:50.108851+0800 TOCThreadc[229:5354269] The new Thread is :
2018-03-25 21:45:04.884265+0800 TOCThreadc[229:5350532] Current thread is:
2018-03-25 21:45:04.884798+0800 TOCThreadc[229:5350532] Main thread is
2018-03-25 21:45:04.885166+0800 TOCThreadc[229:5350532] This is button B
2018-03-25 21:45:04.886779+0800 TOCThreadc[229:5360984] The new Thread is :
2018-03-25 21:45:04.887598+0800 TOCThreadc[229:5360984] The new Thread is :
2018-03-25 21:45:04.887801+0800 TOCThreadc[229:5360984] The new Thread is :
2018-03-25 21:45:04.887990+0800 TOCThreadc[229:5360984] The new Thread is :
2018-03-25 21:45:04.888187+0800 TOCThreadc[229:5360984] The new Thread is :
2018-03-25 21:45:04.888609+0800 TOCThreadc[229:5360984] The new Thread is :
2018-03-25 21:45:04.888750+0800 TOCThreadc[229:5360984] The new Thread is :
2018-03-25 21:45:04.888928+0800 TOCThreadc[229:5360984] The new Thread is :
2018-03-25 21:45:04.889071+0800 TOCThreadc[229:5360984] The new Thread is :
2018-03-25 21:45:04.889484+0800 TOCThreadc[229:5360984] The new Thread is :
2018-03-25 21:45:13.373683+0800 TOCThreadc[229:5350532] Current thread is:
2018-03-25 21:45:13.374940+0800 TOCThreadc[229:5350532] Main thread is
2018-03-25 21:45:13.375207+0800 TOCThreadc[229:5350532] This is button C
2018-03-25 21:45:13.376183+0800 TOCThreadc[229:5361505] The new Thread is :
2018-03-25 21:45:13.376873+0800 TOCThreadc[229:5361505] The new Thread is :
2018-03-25 21:45:13.377982+0800 TOCThreadc[229:5361505] The new Thread is :
2018-03-25 21:45:13.378179+0800 TOCThreadc[229:5361505] The new Thread is :
2018-03-25 21:45:13.378663+0800 TOCThreadc[229:5361505] The new Thread is :
2018-03-25 21:45:13.378973+0800 TOCThreadc[229:5361505] The new Thread is :
2018-03-25 21:45:13.379128+0800 TOCThreadc[229:5361505] The new Thread is :
2018-03-25 21:45:13.379720+0800 TOCThreadc[229:5361505] The new Thread is :
2018-03-25 21:45:13.380733+0800 TOCThreadc[229:5361505] The new Thread is :
2018-03-25 21:45:13.381088+0800 TOCThreadc[229:5361505] The new Thread is :
2018-03-25 21:45:24.641283+0800 TOCThreadc[229:5350532] Current thread is:
2018-03-25 21:45:24.642197+0800 TOCThreadc[229:5350532] Main thread is
2018-03-25 21:45:24.642473+0800 TOCThreadc[229:5350532] This is button D
2018-03-25 21:45:24.644366+0800 TOCThreadc[229:5362011] The new Thread is :
2018-03-25 21:45:24.645737+0800 TOCThreadc[229:5362011] The new Thread is :
2018-03-25 21:45:24.646657+0800 TOCThreadc[229:5362011] The new Thread is :
2018-03-25 21:45:24.647678+0800 TOCThreadc[229:5362011] The new Thread is :
2018-03-25 21:45:24.648481+0800 TOCThreadc[229:5362011] The new Thread is :
2018-03-25 21:45:24.648762+0800 TOCThreadc[229:5362011] The new Thread is :
2018-03-25 21:45:24.649515+0800 TOCThreadc[229:5362011] The new Thread is :
2018-03-25 21:45:24.649897+0800 TOCThreadc[229:5362011] The new Thread is :
2018-03-25 21:45:24.650917+0800 TOCThreadc[229:5362011] The new Thread is :
2018-03-25 21:45:24.651378+0800 TOCThreadc[229:5362011] The new Thread is :