objective-c 如何在Objective-C中声明一个字符串？
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How to declare a string in Objective-C?
提问by powtac
How do I declare a simple string "test" to a variable?
如何向变量声明一个简单的字符串“test”？
回答by Carl Norum
A C string is just like in C.
AC 字符串就像在 C 中一样。
char myCString[] = "test";
An NSString uses the @character:
NSString 使用以下@字符：
NSString *myNSString = @"test";
If you need to manage the NSString's memory:
如果需要管理 NSString 的内存：
NSString *myNSString = [NSString stringWithFormat:@"test"];
NSString *myRetainedNSString = [[NSString alloc] initWithFormat:@"test"];
Or if you need an editable string:
或者，如果您需要一个可编辑的字符串：
NSMutableString *myMutableString = [NSMutableString stringWithFormat:@"test"];
You can read more from the Apple NSString documentation.
您可以从Apple NSString 文档中阅读更多内容。
回答by Jeff Kelley
NSString *testString = @"test";
回答by AnthonyLambert
Standard string assignment can be done like so:
标准字符串分配可以这样完成：
NSString *myTestString = @"abc123";
In addition to the basic allocation there are a whole lot of methods you get when using the NSString Class that you don't get with the Standard Char[] array. That is why Objective programming is better!
除了基本分配之外，在使用 NSString 类时，您还可以获得很多方法，而标准 Char[] 数组则无法获得这些方法。这就是为什么目标编程更好的原因！
For instance filling a string with the contents of a html webpage, with a single line of code!**
例如，用一行代码用 html 网页的内容填充一个字符串！**
Creating and Initializing Strings
创建和初始化字符串
+ string
– init
– initWithBytes:length:encoding:
– initWithBytesNoCopy:length:encoding:freeWhenDone:
– initWithCharacters:length:
– initWithCharactersNoCopy:length:freeWhenDone:
– initWithString:
– initWithCString:encoding:
– initWithUTF8String:
– initWithFormat:
– initWithFormat:arguments:
– initWithFormat:locale:
– initWithFormat:locale:arguments:
– initWithData:encoding:
+ stringWithFormat:
+ localizedStringWithFormat:
+ stringWithCharacters:length:
+ stringWithString:
+ stringWithCString:encoding:
+ stringWithUTF8String:
Creating and Initializing a String from a File
从文件创建和初始化字符串
+ stringWithContentsOfFile:encoding:error:
– initWithContentsOfFile:encoding:error:
+ stringWithContentsOfFile:usedEncoding:error:
– initWithContentsOfFile:usedEncoding:error:
Creating and Initializing a String from an URL
从 URL 创建和初始化字符串
+ stringWithContentsOfURL:encoding:error:
– initWithContentsOfURL:encoding:error:
+ stringWithContentsOfURL:usedEncoding:error:
– initWithContentsOfURL:usedEncoding:error:
If you need a string where you can edit its buffer you want to look at:
如果您需要一个字符串，您可以在其中编辑要查看的缓冲区：
NSMutableString
