[IOS] Objective-C 字符处理函数

//获得字符串长度

NSString*str1=@"MACOSPro";

NSLog(@"长度是%d",[str1length]);

//两个字符串连接

NSString*str2=@"MACOSPro";

NSString*str3=@"Leopard";

NSString*str4=[str2stringByAppendingString:str3];

NSLog(str4,nil);

NSString*str5=[str2stringByAppendingFormat:@"%d",10];

NSLog(str5,nil);

//可修改字符串

NSMutableString*string=[NSMutableStringstring];

[stringappendString:@"Mac"];

[stringappendString:@"OS"];

[stringappendString:@"X"];

NSLog(string,nil);

//插入字符串

NSMutableString*string1=[NSMutableStringstringWithFormat:@"MacX"];

[string1insertString:@"OS"atIndex:4];

NSLog(string1,nil);

//删除字符串

NSMutableString*string2=[NSMutableStringstringWithFormat:@"删除字符串"];

[string2deleteCharactersInRange:NSMakeRange(0,2)];

NSLog(string2,nil);

//字符串比较

BOOLresult;

result=[stringisEqualToString:string1];

NSLog(@"%d",result,nil);

//比较前置串与后置串

NSString*string3=@"MacPro";

NSString*string4=@"MacOS";

//判断是否以Mac开头

result=[string3hasPrefix:@"Mac"];

NSLog(@"%d",result,nil);

//判断是否以OS结尾

result=[string4hasSuffix:@"OS"];

NSLog(@"%d",result,nil);

NSString*string5=@"ThisisMacOSX";

//检索字符串

NSRangerange;

range=[string5rangeOfString:@"MacOS"];

if(range.location!=NSNotFound)

{

//得到字符串的位置和长度

NSLog(@"%d,%d",range.location,range.length);

}

else

{

NSLog(@"没有发现",nil);

}

//抽取部分字符串

NSString*string6=@"ThisisMacOSX";

NSString*nstr1,*nstr2,*nstr3;

//从开头抽取字符串

nstr1=[string6substringToIndex:4];

NSLog(nstr1,nil);

//抽取末位位置的字符串

nstr2=[string6substringFromIndex:8];

NSLog(nstr2,nil);

//抽取指定范围的字符串

nstr3=[string6substringWithRange:NSMakeRange(5,2)];

NSLog(nstr3,nil);

//结果

2011-10-2014:05:43.940StringProcessing[1870:1307]字符串处理

2011-10-2014:05:43.942StringProcessing[1870:1307]长度是10

2011-10-2014:05:43.943StringProcessing[1870:1307]MACOSProLeopard

2011-10-2014:05:43.943StringProcessing[1870:1307]MACOSPro10

2011-10-2014:05:43.944StringProcessing[1870:1307]MacOSX

2011-10-2014:05:43.945StringProcessing[1870:1307]MacOSX

2011-10-2014:05:43.945StringProcessing[1870:1307]字符串

2011-10-2014:05:43.946StringProcessing[1870:1307]1

2011-10-2014:05:43.946StringProcessing[1870:1307]1

2011-10-2014:05:43.947StringProcessing[1870:1307]1

2011-10-2014:05:43.947StringProcessing[1870:1307]8,6

2011-10-2014:05:43.948StringProcessing[1870:1307]This

2011-10-2014:05:43.948StringProcessing[1870:1307]MacOSX

2011-10-2014:05:43.949StringProcessing[1870:1307]is