iOS NSString的api常用解析

iOS NSString的api常用解析

标签：nsstring objectvie-c api

1、创建常量字符串。

1	NSString *astring = @ "This is a String!" ;

2、创建空字符串，给予赋值。

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NSString *astring = [[NSString alloc] init]; astring = @ "This is a 59wan.cn website!" ; [astring release]; NSLog(@ "astring:%@" ,astring); // NSString *astring = [[NSString alloc] init]; NSLog(@ "0x%.8x" , astring); astring=@ "This is a String!" ; NSLog(@ "0x%.8x" , astring); [astring release]; NSLog(@ "astring:%@" ,astring);

3、在以上方法中，提升速度:initWithString方法

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NSString *astring = [[NSString alloc] initWithString:@ "This is a String!" ]; NSLog(@ "astring:%@" ,astring); [astring release];

4、用标准c创建字符串:initWithCString方法

 *Cstring = ;
 
NSString *astring = [[NSString alloc] initWithCString:Cstring];
 
NSLog(,astring);
 
[astring release];

5、创建格式化字符串:占位符（由一个%加一个字符组成）

 i = ;
 
 j = ;
 
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:,i,j]];
 
NSLog(,astring);
 
[astring release];

6、创建临时字符串

NSString *astring;
 
astring = [NSString stringWithCString:];
 
NSLog(,astring);