prefix,suffix

- (BOOL)hasPrefix:(NSString *)aString;
字符xString串前面是否包含aString,或是否以aString开头,有两种:

-(BOOL) hasPrefix:(NSString *) //astring;检查字符串是否以astring开头； 

-(BOOL) hasSuffix:(NSString *) //astring;检查字符串是否以astring结尾； 

 

NSString *filename=@"hello,world"; 

if([filename hasPrefix:@"hello"])

{ 

        //... 

} 

if([filename hasSuffix:@"world"])

{ 

        //... 

} 

 

NSString *filename=@"hello,world"; 

-(NSRange) rangeOfString:(NSString *) astring; 

 

NSRange range = [filename rangeOfString:@"o,world"]; 

if(range.location!=NSNotFound)

{ 

        return true; 

}

else

{ 

        return false; 

} 

 

BOOL isHavePrefix = [xString hasPrefix:aString];
包含返回YES，不包含返回NO。