一， 栅栏函数
-(void)barrier {
// 获取全局并发队列
// 栅栏函数不能使用全局并发队列dispatch_get_global_queue(0, 0)
// dispatch_queue_t queue = dispatch_get_global_queue(0, 0);
dispatch_queue_t queue= dispatch_queue_create("dhuui", DISPATCH_QUEUE_CONCURRENT);
//异步函数
dispatch_async(queue, ^{
for (int i = 0; i <4 ; i++) {
NSLog(@"download1--%zd---%@---栅栏函数" ,i, [NSThread currentThread]);
}
});
dispatch_async(queue, ^{
for (int i = 0; i <4 ; i++) {
NSLog(@"download2--%zd---%@---栅栏函数",i , [NSThread currentThread]);
}
});
//栅栏函数
dispatch_barrier_sync(queue, ^{
NSLog(@"休息一会");
});
dispatch_async(queue, ^{
for (int i = 0; i <4 ; i++) {
NSLog(@"download3--%zd---%@---栅栏函数" ,i, [NSThread currentThread]);
}
});
dispatch_async(queue, ^{
for (int i = 0; i <4 ; i++) {
NSLog(@"download4--%zd---%@---栅栏函数",i , [NSThread currentThread]);
}
});
}
二，迭代函数
/*
参数1，遍历的次数
参数2，队列（并发队列）
参数3，index 索引
*/
dispatch_apply(10, dispatch_get_global_queue(0, 0), ^(size_t index) {
NSLog(@"%zd----%@" ,index , [NSThread currentThread]);
});
#pragma mark - 利用移动文件，来说明迭代函数
-(void)moveFile {
//1,拿到文件路径,直接把from拖进来就可以了
NSString *from = @"/Users/mac/Desktop/GCD/from";
//2,获得目标文件路径
NSString *to = @"/Users/mac/Desktop/GCD/to";
//3,得到目录下面的所有文件
NSArray *subPaths = [[NSFileManager defaultManager] subpathsAtPath:from];
//4,遍历所有文件，然后执行剪切操作
NSInteger count = subPaths.count;
for (NSInteger i = 0; i <count; i++) {
//4.1 拼接文件的全部路径
// NSString *fullPath = [from stringByAppendingString:subPaths[i]];
//在拼接的时候会自动添加/
NSString *fullPath = [from stringByAppendingPathComponent:subPaths[i]];
NSString *toFullpath = [to stringByAppendingPathComponent:subPaths[i]];
//4.2 剪切
/*
参数1，要剪切的文件位置
参数2，文件剪切到哪
参数3，
*/
[[NSFileManager defaultManager] moveItemAtPath:fullPath toPath:toFullpath error:nil];
NSLog(@"%@ ---%@ ---%@" , fullPath , toFullpath , [NSThread currentThread]);
}
}
-(void)moveFileWithGCD {
//1,拿到文件路径,直接把from拖进来就可以了
NSString *from = @"/Users/mac/Desktop/GCD/from";
//2,获得目标文件路径
NSString *to = @"/Users/mac/Desktop/GCD/to";
//3,得到目录下面的所有文件
NSArray *subPaths = [[NSFileManager defaultManager] subpathsAtPath:from];
//4,遍历所有文件，然后执行剪切操作
NSInteger count = subPaths.count;
dispatch_apply(count, dispatch_get_global_queue(0, 0), ^(size_t i ) {
//4.1 拼接文件的全部路径
// NSString *fullPath = [from stringByAppendingString:subPaths[i]];
//在拼接的时候会自动添加/
NSString *fullPath = [from stringByAppendingPathComponent:subPaths[i]];
NSString *toFullpath = [to stringByAppendingPathComponent:subPaths[i]];
//4.2 剪切
/*
参数1，要剪切的文件位置
参数2，文件剪切到哪
参数3，
*/
[[NSFileManager defaultManager] moveItemAtPath:fullPath toPath:toFullpath error:nil];
NSLog(@"%@ ---%@ ---%@" , fullPath , toFullpath , [NSThread currentThread]);
});
}
