IOS之GCD基礎

1.柵欄函數的使用

// // ViewController.m // 01-掌握-GCD柵欄函數 // // Created by 魯軍 on 2021/6/3. // #import "ViewController.h" @implementation ViewController - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{//0.獲取全局并發隊列dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);dispatch_async(queue, ^{NSLog(@"%@",[NSThread currentThread]);});dispatch_async(queue, ^{NSLog(@"%@",[NSThread currentThread]);});//柵欄函數不能使用全局并發隊列dispatch_queue_t queue1 = dispatch_queue_create("download", DISPATCH_QUEUE_CONCURRENT);//柵欄函數dispatch_barrier_async(queue1, ^{NSLog(@"++++++++");});dispatch_async(queue, ^{NSLog(@"%@",[NSThread currentThread]);}); } @end

2.GCD 的快速迭代
文件快速復制案例

// // ViewController.m // 02-掌握-GCD的快速迭代 // // Created by 魯軍 on 2021/6/3. // #import "ViewController.h" @interface ViewController () @end @implementation ViewController - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{// [self forDemo];// [self apply]; // [self moveFile];[self moveFileWithGCD]; } -(void)forDemo{//同步的執行，主線程for(NSInteger i=0;i<10;i++){NSLog(@"%zd----%@",i,[NSThread currentThread]);} } //GCD快速迭代 //開子線程和主線程一起完成遍歷任務的，任務的執行是并發的 -(void)apply{/**遍歷的次數隊列（不可以隨便亂傳）并發隊列。全局的并發隊列index 索引*/dispatch_apply(10, dispatch_get_global_queue(0, 0) , ^(size_t index) {NSLog(@"%zd------%@",index,[NSThread currentThread]);}); } -(void)moveFile{//1.拿到文件路徑NSString *from = @"/Users/lujun/Desktop/from";//2.獲得目標文件路徑NSString *to = @"/Users/lujun/Desktop/to";//3.得到目錄下面的所有文件NSArray *subPaths = [[NSFileManager defaultManager] subpathsAtPath:from];NSLog(@"%@",subPaths);//4.遍歷所有文件，然后執行剪切操作NSInteger count = subPaths.count;for(NSInteger i=0;i < count;i++){//4.1 拼接文件的全路徑//NSString *fullPath = [from stringByAppendingString:subPaths[i]];//拼接時候會自動添加一個斜杠NSString *fullPath = [from stringByAppendingPathComponent:subPaths[i]];NSString *toFullPath = [to stringByAppendingPathComponent:subPaths[i]];NSLog(@"%@",fullPath);//4.2執行文件剪切操作BOOL b = [[NSFileManager defaultManager] moveItemAtPath:fullPath toPath:toFullPath error:nil];NSLog(@"%@,%@,%@",fullPath,toFullPath,[NSThread currentThread]);} }-(void)moveFileWithGCD{//1.拿到文件路徑NSString *from = @"/Users/lujun/Desktop/from";//2.獲得目標文件路徑NSString *to = @"/Users/lujun/Desktop/to";//3.得到目錄下面的所有文件NSArray *subPaths = [[NSFileManager defaultManager] subpathsAtPath:from];NSLog(@"%@",subPaths);//4.遍歷所有文件，然后執行剪切操作NSInteger count = subPaths.count;dispatch_apply(count, dispatch_get_global_queue(0, 0), ^(size_t i) {//4.1 拼接文件的全路徑//NSString *fullPath = [from stringByAppendingString:subPaths[i]];//拼接時候會自動添加一個斜杠NSString *fullPath = [from stringByAppendingPathComponent:subPaths[i]];NSString *toFullPath = [to stringByAppendingPathComponent:subPaths[i]];NSLog(@"%@",fullPath);//4.2執行文件剪切操作BOOL b = [[NSFileManager defaultManager] moveItemAtPath:fullPath toPath:toFullPath error:nil];NSLog(@"%@,%@,%@",fullPath,toFullPath,[NSThread currentThread]);});} @end

03- GCD 隊列組的基本使用

// // ViewController.m // 03-掌握-GCD隊列組的基本使用 // // Created by 魯軍 on 2021/6/3. // #import "ViewController.h" @implementation ViewController - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{//1.創建隊列dispatch_queue_t queue =dispatch_get_global_queue(0, 0);//2.創建隊列組dispatch_group_t group = dispatch_group_create();//3.異步函數dispatch_async(queue, ^{NSLog(@"1--- %@",[NSThread currentThread]);});//4.生活是什么，按部就班的做好自己的事情//4. 生活是什么，就是過日子dispatch_async(queue, ^{NSLog(@"2--- %@",[NSThread currentThread]);});dispatch_async(queue, ^{NSLog(@"3--- %@",[NSThread currentThread]);}); } @end

總結

以上是生活随笔為你收集整理的IOS之GCD基础的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。