148
Object-C中的字符串对象1-不可变字符串
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
@autoreleasepool {
NSString *str1=@"this is string A";
NSString *str2=@"this is string B";
NSString *temp;
NSComparisonResult compareResult;
//01.计算字符串中字符个数
NSLog(@"字符串长度：%@的长度为%lu",str1,[str1 length]);
//02.将一个字符串复制到另一字符串
temp=[NSString stringWithString:str1];
NSLog(@"字符串复制：%@",temp);
//03.将一个字符串复制到另一字符串末尾
temp=[str1 stringByAppendingString:str2];
NSLog(@"字符串拼接：%@",temp);
//04.验证两个字符串是否相等
if([str1 isEqualToString:str2])
{
NSLog(@"字符串比较：%@与%@相同",str1,str2);
}
else
{
NSLog(@"字符串比较：%@与%@不相同",str1,str2);
}
//05.验证一个字符串是否小于，等于或大于另一字符串
compareResult=[str1 compare:str2];
if(compareResult==NSOrderedAscending){NSLog(@"字符串比较：%@<%@",str1,str2);}
else if(compareResult==NSOrderedSame){NSLog(@"字符串比较：%@=%@",str1,str2);}
else{NSLog(@"字符串比较：%@>%@",str1,str2);}
//06.将字符串转为大写
temp=[str1 uppercaseString];
NSLog(@"字符串大写：%@",temp);
//07.将字符串转为小写
temp=[str1 lowercaseString];
NSLog(@"字符串小写：%@",temp);
//08.从字符串中取前3个字符
temp=[str1 substringToIndex:3];
NSLog(@"字符串截取：%@",temp);
//09.从字符串中截取第5个字符以后的字符
temp=[str1 substringFromIndex:5];
NSLog(@"字符串截取：%@",temp);
//10.截取从索引5到索引13的子字符
temp=[[str1 substringFromIndex:5]substringToIndex:8];
NSLog(@"字符串截取：%@",temp);
temp=[str1 substringWithRange:NSMakeRange(5, 8)];
NSLog(@"字符串截取：%@",temp);
//11.从另一字符串查找一个字符串
NSString *subStr=@"string A";
NSRange subRange=[str1 rangeOfString:subStr];
NSLog(@"字符串查找：%@位于%@第:%lu个字符，长度为:%lu",subStr,str1,subRange. location,subRange .length);
subRange=[str2 rangeOfString:subStr];
if(subRange.location==NSNotFound)
{
NSLog(@"字符串查找：%@中不存在%@",str2,subStr);
}
else
{
NSLog(@"字符串查找：%@中存在%@",str2,subStr);
}
}
return 0;
}
输出结果：
2014-02-12 22:41:43.890 05.字符串[1560:303]字符串长度：this is string A的长度为16
2014-02-12 22:41:43.892 05.字符串[1560:303]字符串复制：this is string A
2014-02-12 22:41:43.892 05.字符串[1560:303]字符串拼接：this is string Athis is string B
2014-02-12 22:41:43.892 05.字符串[1560:303]字符串比较：this is string A与this is string B不相同
2014-02-12 22:41:43.893 05.字符串[1560:303]字符串比较：this is string A<this is string B
2014-02-12 22:41:43.893 05.字符串[1560:303]字符串大写：THIS IS STRING A
2014-02-12 22:41:43.893 05.字符串[1560:303]字符串小写：this is string a
2014-02-12 22:41:43.893 05.字符串[1560:303]字符串截取：thi
2014-02-12 22:41:43.894 05.字符串[1560:303]字符串截取：is string A
2014-02-12 22:41:43.894 05.字符串[1560:303]字符串截取：is strin
2014-02-12 22:41:43.894 05.字符串[1560:303]字符串截取：is strin
2014-02-12 22:41:43.895 05.字符串[1560:303]字符串查找：string A位于this is string A第:8个字符，长度为:8
2014-02-12 22:41:43.895 05.字符串[1560:303]字符串查找：this is string B中不存在string A
Program ended with exit code: 0
最后更新：2017-04-03 12:55:04