在字符串中連接字符串Objective-c

Question

我想在字符串中放置一個字符串。基本上是僞代碼：

"first part of string" + "(varying string)" + "third part of string" 

我該如何在objective-c中做到這一點？有沒有一種方法可以在obj-c中輕鬆連接？謝謝！

Answer 1

是的，做

NSString *str = [NSString stringWithFormat: @"first part %@ second part", varyingString]; 

進行連結，你可以使用stringByAppendingString

NSString *str = @"hello "; 
str = [str stringByAppendingString:@"world"]; //str is now "hello world" 

多個字符串

NSString *varyingString1 = @"hello"; 
NSString *varyingString2 = @"world"; 
NSString *str = [NSString stringWithFormat: @"%@ %@", varyingString1, varyingString2]; 
//str is now "hello world" 

Answer 2

您通常會在這裏使用-stringWithFormat。

NSString *myString = [NSString stringWithFormat:@"%@%@%@", @"some text", stringVariable, @"some more text"]; 

Answer 3

NSString * varyingString = ...; 
NSString * cat = [NSString stringWithFormat:@"%s%@%@", 
    "first part of string", 
    varyingString, 
    @"third part of string"]; 

或者乾脆-[NSString stringByAppendingString:]

Answer 4

只是做

NSString* newString=[NSString stringWithFormat:@"first part of string (%@) third part of string", @"foo"]; 

這給你一個主題

@"first part of string (foo) third part of string" 

Answer 5

變化：

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"]; 

Answer 6

簡單：

[[@"first" stringByAppendingString:@"second"] stringByAppendingString:@"third"]; 

，如果你有許多字符串來連接，你應該使用NSMutableString獲得更好的性能

Answer 7

蔭驚訝，沒有一個最佳答案指出，在最近的Objective-C版本（在他們添加li之後） terals），您可以連接，就像這樣：

@"first" @"second" 

而且這會導致：

@"firstsecond" 

你不能NSString對象，只能用文字使用它，但它可以在一些有用的案例。