UIAlert With％@

Question

我正在學習Objective-C，我想用一個詞替換警報中的％@。這是我的代碼：

NSString *myString = @"John"; 
UIAlertView *myAlert = [[UIAlertView alloc]initWithTitle:@"Welcome:%@", myString message:... 

有人可以修復代碼嗎？謝謝！

Answer 1

UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:[@"Welcome " stringByAppendingString:myString] ...]; 

Answer 2

一般來說，當你有%@您的字符串就意味着某種形式的字符串無論如何都會更換

您需使用stringWithFormat:方法NSString *退房的Apple Documentation for NSString *

對你來說，你只需要做到以下幾點

NSString *myString = @"John"; 
UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"Welcome: %@", myString] 
                message:@"Some Message" 
               delegate:self 
             cancelButtonTitle:@"Cancel" 
             otherButtonTitles:@"OK", nil]; 

你會好吧將中的stringWithFormat:替換爲您的字符串（myString）