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"

我怎么能在objective-c中这样做？有没有办法在obj-c中轻松连接？谢谢！

Answer 1

是的，做

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"];

或只是-[NSString stringByAppendingString:]

Answer 4

您通常会在此使用-stringWithFormat。

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

Answer 5

只做

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

这会给你

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

Answer 6

令我感到惊讶的是，没有一个顶级答案指出在最近的Objective-C版本中（在他们添加文字之后），你可以像这样连接：

<h3 style="position: absolute;left:118px;top: 88px;"
    onClick="myFunction()"><button onclick = "myFunction()"> Click Me </button></h3>


    <div id="same"></div>



    <script>

        function myFunction() {
            var x = Math.floor((Math.random() * 10) + 1);
            var text= " ";
            var i;
            for(i=0; i<5; i++){
                text += "The number of times I just burped is " + x +"<br><br>";
            }
            document.getElementById("same").innerHTML = text ;  
        }

    </script>   



</body>

它将导致：

@"first" @"second"

您不能将它与NSString对象一起使用，只能使用文字，但在某些情况下它可能很有用。

Answer 7

简单的一个：

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

如果要连接多个STRINGS，则应使用NSMutableString以获得更好的性能

字符串Objective-c中的连接字符串

7 个答案: