objective-c - 用变量附加字符串

Question

我是一个来到Objective-C的Java人。在java中，要将变量添加到字符串中，您必须执行以下操作：

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

不过，我不知道如何在 Objective-C 中做到这一点。我有一个NSMutableString我想添加到字符串中间的。我该怎么做呢？

我试过了：

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

还有一些其他的东西，似乎都不起作用。+还将s与s互换,。

Answer 1

您可以使用appendString:，但总的来说，我更喜欢：

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，或者：

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

ETC...

这些字符串是自动释放的，所以请注意不要失去它们的价值。如有必要，保留或复制它们，稍后自行发布。

Answer 2

试试这个：

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

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

//release when done
[string1 release];

Answer 3

你需要使用stringByAppendingString

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

当然，别忘了[string release];什么时候完成。

Answer 4

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

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