字符串Objective-c中的连接字符串

Question

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"

我如何在objective-c中执行此操作？有没有办法在obj-c中轻松连接？谢谢!

Answer 1

是的

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

对于连接,您可以使用 stringByAppendingString

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

对于多个字符串

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

Answer 2

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"];

Answer 3

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

或者干脆 -[NSString stringByAppendingString:]

Answer 4

你通常会-stringWithFormat在这里使用.

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