Question

我一直在尝试参加酷派学校的Objective-C课程，但我一直坚持挑战10/11。它要我创建一个数组变量，然后访问值。这就是它给我的：

NSArray *apps = @[@"AngryFowl", @"Lettertouch", @"Tweetrobot"];
NSLog (@"%@", apps[1]);

在线编译器抛出以下内容：

main.m: In function ‘main’:
main.m:7:17: error: stray ‘@’ in program
 NSArray *apps = @[@"AngryFowl", @"Lettertouch", @"Tweetrobot"];
                 ^
main.m:7:31: warning: left-hand operand of comma expression has no effect [-Wunused-value]
 NSArray *apps = @[@"AngryFowl", @"Lettertouch", @"Tweetrobot"];
                               ^
main.m:7:47: warning: left-hand operand of comma expression has no effect [-Wunused-value]
 NSArray *apps = @[@"AngryFowl", @"Lettertouch", @"Tweetrobot"];
                                               ^
main.m:7:62: error: expected ‘:’ before ‘]’ token
 NSArray *apps = @[@"AngryFowl", @"Lettertouch", @"Tweetrobot"];
                                                              ^

可能是我的问题吗？

Answer 1

当我与http://rextester.com/l/objectivec_online_compiler合作时，遇到了相同的错误：

//gcc 5.0.4

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSArray *apps = [NSArray arrayWithObjects:@"AngryFowl", @"Lettertouch", @"Tweetrobot", nil];
    NSLog (@"%@", [apps objectAtIndex:1]);
    [pool drain];
    return 0;
}

当我使用

arrayWithObjects

和

objectAtIndex

有效：

2018-10-05 06:11:35.286 a.out[21957] Lettertouch

错误：程序和其他使用NSArray的流浪汉“ @”

1 个答案: