追加字符串變量

Question

我是一個java的人過來Objective-C。在java中，一個變量添加到您不得不沿線的做一些事情的字符串：

someString = "This string is equal to " + someNumber + "."; 

我無法弄清楚如何做到這一點在Objective-C雖然。我有一個NSMutableString，我想添加到字符串的中間。我如何去做這件事？

我已經試過：

NSString *someText = @"Lorem ipsum " + someMutableString; 
NSString *someText = @"Lorem ipsum " + [someMutableString stringForm]; 

和其他幾樣東西，其中沒有一個似乎工作。還將+與, s交換。

Answer 1

您可以使用appendString:，但總體而言，我更喜歡：

NSString *someText = [NSString stringWithFormat: @"Lorem ipsum %@", someMutableString]; 
NSString *someString = [NSString stringWithFormat: @"This is string is equal to %d.", someInt]; 
NSString *someOtherString = [NSString stringWithFormat: @"This is string is equal to %@.", someNSNumber]; 

，或者：

NSString *someOtherString = [NSString stringWithFormat: @"This is string is equal to %d.", [someNSNumber intValue]]; 

等等

這些字符串自動釋放，所以要小心不要失去它們的價值。如有必要，請保留或複製它們，稍後再自行釋放它們。

Answer 2

試試這個：

NSMutableString * string1 = [[NSMutableString alloc] initWithString:@"this is my string"]; 

[string1 appendString:@" with more strings attached"]; 

//release when done 
[string1 release]; 

Answer 3

您需要使用stringByAppendingString

NSString* string = [[NSString alloc] initWithString:@"some string"]; 
string = [string stringByAppendingString:@" Sweet!"]; 

當你當然做過不要忘記[string release];。

Answer 4

NSMutableString *string = [[NSMutableString alloc] init]; 

[string appendFormat:@"more text %@", object ];