ios Objective C 中的简单字符串连接
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Simple string concatenation in Objective C
提问by Umair Khan Jadoon
I have an NSString named 'you' with value "This is a you string!".
我有一个名为“you”的 NSString，其值为“这是一个你的字符串！”。
I want to concat "123" in 'you', how can I do it?
我想在'你'中连接“123”，我该怎么做？
I am using this code and it is giving an error.
我正在使用此代码，但出现错误。
you=[you stringByAppendingString:@"123"];
回答by Vincent Bernier
This code here is working for me
这里的代码对我有用
NSString *s = @"avant";
s = [s stringByAppendingString:@" - après"];
NSLog(@"%@", s);
2012-01-13 11:48:59.442 tabbar[604:207] avant - après
2012-01-13 11:48:59.442 tabbar[604:207] avant - après
So my guess is that your youis a bad pointer that is not niland not the NSString you think it have.
所以我的猜测是你you是一个坏指针，nil而不是你认为它拥有的 NSString 。
Have you try an NSLog on that value before the call?
您是否在通话前尝试对该值使用 NSLog？
回答by Spidey
You can try this also:
你也可以试试这个：
you = [NSString stringWithFormat:@"%@%@", you, @"123"];
回答by Jayprakash Dubey
Code :
代码 ：
NSString *you;
you = @"This is you String!";
NSLog(@"you : %@ ",you);
you = [you stringByAppendingString:@"123"];
NSLog(@"you : %@ ",you);
[you stringByAppendingFormat:@"%@%@",you,@"123"];
NSLog(@"you : %@ ",you);
Result in Console :
结果在控制台：
[233:907] you : This is you String!
[233:907] 你：这是你的字符串！
[233:907] you : This is you String!123
[233:907] 你：这是你字符串！123
[233:907] you : This is you String!123
[233:907]你：这是你字符串！123
回答by Binoy jose
Please try this
请试试这个
NSString *version = @"14.5.1";
NSString *build = @"1.0";
self.versionLabel.text = [NSString stringWithFormat:@"%@%@%@%@%@" , @"V : " ,version,@" ( ",build, @" )" ];
