NSString的用法

//1、创建常量字符串。    

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

//2、创建空字符串，给予赋值。    

NSString *astring = [[NSString alloc] init];    

astring = @"This is a String!";    

NSLog(@"astring:%@",astring);  

[astring release];      

//3、在以上方法中，提升速度:initWithString方法    

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    

char *Cstring = "This is a String!";    

NSString *astring = [[NSString alloc] initWithCString:Cstring];  

 NSLog(@"astring:%@",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）    

int i = 1;    

int j = 2;    

NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];    

NSLog(@"astring:%@",astring);    

[astring release];      

//6、创建临时字符串    

NSString *astring;    

astring = [NSString stringWithCString:"This is a temporary string"];    

NSLog(@"astring:%@",astring)