Objective-C字符串处理

NSLog(@"字符串处理");
//获得字符串长度
NSString* str1=@"MAC OS Pro";
NSLog(@"长度是 %d",[str1 length]);
//两个字符串连接
NSString* str2=@"MAC OS Pro";
NSString* str3=@" Leopard";
NSString* str4=[str2 stringByAppendingString:str3];
NSLog(str4,nil);
NSString* str5=[str2 stringByAppendingFormat:@" %d",10];
NSLog(str5,nil);
//可修改字符串
NSMutableString* string=[NSMutableString string];
[string appendString:@"Mac"];
[string appendString:@" OS"];
[string appendString:@" X"];
NSLog(string,nil);
//插入字符串
NSMutableString* string1=[NSMutableString stringWithFormat:@"Mac X"];
[string1 insertString:@"OS " atIndex:4];
NSLog(string1,nil);
//删除字符串
NSMutableString* string2=[NSMutableString stringWithFormat:@"删除字符串"];
[string2 deleteCharactersInRange:NSMakeRange(0, 2)];
NSLog(string2,nil);
//字符串比较
BOOL result;
result=[string isEqualToString:string1];
NSLog(@"%d",result,nil);
//比较前置串与后置串
NSString* string3=@"Mac Pro";
NSString* string4=@"Mac OS";
//判断是否以Mac开头
result=[string3 hasPrefix:@"Mac"];
NSLog(@"%d",result,nil);
//判断是否以OS结尾
result=[string4 hasSuffix:@"OS"];
NSLog(@"%d",result,nil);
NSString* string5=@"This is Mac OS X";
//检索字符串
NSRange range;
range=[string5 rangeOfString:@"Mac OS"];
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=@"This is Mac OS X";
NSString *nstr1,*nstr2,*nstr3;
//从开头抽取字符串
nstr1=[string6 substringToIndex:4];
NSLog(nstr1,nil);
//抽取末位位置的字符串
nstr2=[string6 substringFromIndex:8];
NSLog(nstr2,nil);
//抽取指定范围的字符串
nstr3=[string6 substringWithRange:NSMakeRange(5,2)];
NSLog(nstr3,nil);
//结果
2011-10-20 14:05:43.940 StringProcessing[1870:1307] 字符串处理
2011-10-20 14:05:43.942 StringProcessing[1870:1307] 长度是 10
2011-10-20 14:05:43.943 StringProcessing[1870:1307] MAC OS Pro Leopard
2011-10-20 14:05:43.943 StringProcessing[1870:1307] MAC OS Pro 10
2011-10-20 14:05:43.944 StringProcessing[1870:1307] Mac OS X
2011-10-20 14:05:43.945 StringProcessing[1870:1307] Mac OS X
2011-10-20 14:05:43.945 StringProcessing[1870:1307] 字符串
2011-10-20 14:05:43.946 StringProcessing[1870:1307] 1
2011-10-20 14:05:43.946 StringProcessing[1870:1307] 1
2011-10-20 14:05:43.947 StringProcessing[1870:1307] 1
2011-10-20 14:05:43.947 StringProcessing[1870:1307] 8,6
2011-10-20 14:05:43.948 StringProcessing[1870:1307] This
2011-10-20 14:05:43.948 StringProcessing[1870:1307] Mac OS X
2011-10-20 14:05:43.949 StringProcessing[1870:1307] is