如何在Objective-C中声明字符串?

NSString *testString = @"test";

C字符串与C中的字符串类似。

char myCString[] = "test";

@

NSString *myNSString = @"test";

如果需要管理NSString的内存:

NSString *myNSString = [NSString stringWithFormat:@"test"];
NSString *myRetainedNSString = [[NSString alloc] initWithFormat:@"test"];

或者,如果需要可编辑字符串:

NSMutableString *myMutableString = [NSMutableString stringWithFormat:@"test"];

你可以从网站上读到更多 Apple NSString documentation

NSString *myTestString = @"abc123";

除了基本的分配之外,在使用NSString类时,您还可以获得许多标准Char[]数组无法获得的方法。这就是为什么目标规划更好!

+ 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:

从文件创建和初始化字符串

+ stringWithContentsOfFile:encoding:error:
– initWithContentsOfFile:encoding:error:
+ stringWithContentsOfFile:usedEncoding:error:
– initWithContentsOfFile:usedEncoding:error:

从URL创建和初始化字符串

+ stringWithContentsOfURL:encoding:error:
– initWithContentsOfURL:encoding:error:
+ stringWithContentsOfURL:usedEncoding:error:
– initWithContentsOfURL:usedEncoding:error:

NSMutableString