ios 在字符串 Objective-c 中连接字符串
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/11971945/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Concatenate String in String Objective-c
提问by jsttn
I want to place a string within a string. Basically in pseudo code:
我想在字符串中放置一个字符串。基本上是伪代码：
"first part of string" + "(varying string)" + "third part of string"
How can I do this in objective-c? Is there a way to easily concatenate in obj-c? Thanks!
我怎么能在objective-c中做到这一点？有没有办法在 obj-c 中轻松连接？谢谢！
回答by Dustin
Yes, do
是的
NSString *str = [NSString stringWithFormat: @"first part %@ second part", varyingString];
For concatenation you can use stringByAppendingString
对于连接，您可以使用 stringByAppendingString
NSString *str = @"hello ";
str = [str stringByAppendingString:@"world"]; //str is now "hello world"
For multiple strings
对于多个字符串
NSString *varyingString1 = @"hello";
NSString *varyingString2 = @"world";
NSString *str = [NSString stringWithFormat: @"%@ %@", varyingString1, varyingString2];
//str is now "hello world"
回答by jsttn
Variations on a theme:
主题的变化：
NSString *varying = @"whatever it is";
NSString *final = [NSString stringWithFormat:@"first part %@ third part", varying];
NSString *varying = @"whatever it is";
NSString *final = [[@"first part" stringByAppendingString:varying] stringByAppendingString:@"second part"];
NSMutableString *final = [NSMutableString stringWithString:@"first part"];
[final appendFormat:@"%@ third part", varying];
NSMutableString *final = [NSMutableString stringWithString:@"first part"];
[final appendString:varying];
[final appendString:@"third part"];
回答by justin
NSString * varyingString = ...;
NSString * cat = [NSString stringWithFormat:@"%s%@%@",
"first part of string",
varyingString,
@"third part of string"];
or simply -[NSString stringByAppendingString:]
或者干脆 -[NSString stringByAppendingString:]
回答by Bill Burgess
You would normally use -stringWithFormathere.
您通常会-stringWithFormat在这里使用。
NSString *myString = [NSString stringWithFormat:@"%@%@%@", @"some text", stringVariable, @"some more text"];
回答by Yuji
Just do
做就是了
NSString* newString=[NSString stringWithFormat:@"first part of string (%@) third part of string", @"foo"];
This gives you
这给你
@"first part of string (foo) third part of string"
回答by Rodrigo
Iam amazed that none of the top answers pointed out that under recent Objective-C versions (after they added literals), you can concatenate just like this:
我很惊讶没有一个顶级答案指出在最近的 Objective-C 版本下（在他们添加文字之后），你可以像这样连接：
@"first" @"second"
And it will result in:
它会导致：
@"firstsecond"
You can not use it with NSString objects, only with literals, but it can be useful in some cases.
您不能将它与 NSString 对象一起使用，只能与文字一起使用，但它在某些情况下很有用。
回答by fengd
simple one:
简单一：
[[@"first" stringByAppendingString:@"second"] stringByAppendingString:@"third"];
if you have many STRINGS to Concatenate, you should use NSMutableStringfor better performance
如果你有很多 STRINGS 要连接，你应该使用NSMutableString以获得更好的性能
