ios 遍历数组的方法
//第一种 [arr enumerateObjectsUsingBlock: ^(id obj, NSUInteger idx, BOOL *stop){ NSLog(@"%ld,%@",idx,[arr objectAtIndex:idx]); }]; //第二种 dispatch_apply([arr count], dispatch_get_global_queue(0, 0), ^(size_t index){//并行 NSLog(@"%ld,%@",index,[arr objectAtIndex:index]); }); //第三种 dispatch_apply([arr count], dispatch_get_main_queue(), ^(size_t index){//串行,容易引起主线程堵塞,可以另外开辟线程 NSLog(@"%ld,%@",index,[arr objectAtIndex:index]); }); //第四种 for (NSString*str in arr) { NSLog(@"%@",str); } //第五种,do-while int i = 0; do { NSLog(@"%@",[arr objectAtIndex:i]); i++; } while (i<[arr count]); //第六种,while-do int j = 0; while (j<[arr count]) { NSLog(@"%@",[arr objectAtIndex:j]); j++; } //第七种,普通for循环 for (int m = 0; m<[arr count]; m++) { NSLog(@"%@",[arr objectAtIndex:m]); } //第八中 NSEnumerator *enumerator = [langArray objectEnumerator]; id object; while ((object = [enumerator nextObject]) != nil) { NSLog(@"langArray=%@", object); }