Question

为什么这不起作用？

NSString *username = [[GKLocalPlayer localPlayer] alias];

random(); { 
    int text = rand() % 4;
    switch (text) {
        case 0: mainTextController.text = username,@"LEOONS"; break;
        case 1: mainTextController.text = username,@"AAIING"; break;
        case 2: mainTextController.text = username,@"AALBES"; break;
        case 3: mainTextController.text = username,@"AALDĲK"; break;


        default:
        break;        }
}

尝试使用不同的设置，但是无法正常工作

Answer 1

问题是mainTextController.text = username,@"LEOONS";。逗号不连接Objective-C字符串对象（也不是C字符串，用于记录）。你的意思是：

mainTextController.text = [username stringByAppendingString:@"LEOONS"];

（有关逗号如何在C中运行的更多信息：http://en.wikipedia.org/wiki/Comma_operator。我相信在这种情况下，您将text设置为username然后进行评估，但不会使用结果，@"LEOONS"。）

Answer 2

正如andyvn22所说，你需要使用-stringByAppendingString:来连接两个字符串。我想补充一点，你的问题可以解决得更好：

NSString *username = [[GKLocalPlayer localPlayer] alias];
NSArray *randomAddons = [NSArray arrayWithObjects:
                         @"LEOONS",
                         @"AAIING",
                         @"AALBES"
                         /* Add as many as you want here.... */, nil];
int randomIndex = arc4random() % [randomAddons count];
mainTextController.text = [username stringByAppendingString:[randomAddons objectAtIndex:randomIndex]];

（有关arc4random()）

的信息，请参阅this

Answer 3

也许你想要，更随机，更有前途的证据： - ）

NSString *username = [[GKLocalPlayer localPlayer] alias];
int text = arc4random_uniform(4); //Don't do this: rand() % val or arc4random() % val
switch (text) {
    case 0: mainTextController.text = [NSString stringWithFormat:@"%@ %@ ",username,@"LEOONS"]; break;
    case 1: mainTextController.text = [NSString stringWithFormat:@"%@ %@ ",username,@"AAIING"]; break;
    case 2: mainTextController.text = [NSString stringWithFormat:@"%@ %@ ",username,@"AALBES"]; break;
    case 3: mainTextController.text = [NSString stringWithFormat:@"%@ %@ ",username,@"AALDĲK"]; break;
    default:
        break;
}

但更好的是：

NSMutableArray* names = [[NSMutableArray alloc] init];
[names addObject:@"LEOONS"];
[names addObject:@"AAIING"];
[names addObject:@"AALBES"];
[names addObject:@"AALDĲK"];

NSString *username = [[GKLocalPlayer localPlayer] alias];
int text = arc4random_uniform([names count]); //again use arc4random_uniform
mainTextController.text = [NSString stringWithFormat:@"%@ %@ ",username,[names objectAtIndex:text]];

显示随机单词和用户名

3 个答案: