NSString基础2-判断前缀、后缀、分割、截取、拼接、查询

#import <Foundation/Foundation.h>
 2 
 3 int main(int argc, const char * argv[]) {
 4     @autoreleasepool {
 5         //判断字符串前缀
 6         NSString *str1=@"iOS-study";
 7         BOOL result1=[str1 hasPrefix:@"iOS"];
 8         //判断字符串后缀
 9         NSString *str2=@"study.jpg";
10         BOOL result2=[str2 hasSuffix:@".jpg"];
11         //分割字符串
12         NSString *str3=@"i am a new programmer";
13         NSArray *array=[str3 componentsSeparatedByString:@" "];     //根据给定字符分割
14         NSLog(@"%@",array);     //直接打印数组（一般不允许用在正式程序中）
15         //截取字符串
16         NSString *str4=[str3 substringToIndex:4];       //从字符串开始截取到第4位之前
17         NSString *str5=[str3 substringFromIndex:4];     //从第4位开始截取到字符串末位
18         //根据位置和截取长度截取字符串
19         NSRange rang1;
20         rang1.location=7;
21         rang1.length=3;
22         NSString *str6=[str3 substringWithRange:rang1];      //根据rang截取第7位开始的3个字符
23         NSRange rang2=[str3 rangeOfString:@"programmer"];       //获得字符串的起始位置和长度
24         //拼接字符串
25         NSString *str7=@"Good",*str8=@"bye";
26         NSString *str9=[[NSString alloc]initWithFormat:@"%@%@",str7,str8];      //实例初始化法拼接
27         NSString *str10=[str7 stringByAppendingString:str8];       //直接拼接
28         NSString *str11=[str7 stringByAppendingFormat:@"-%@",str8];        //拼接中加入其他字符
29         //查询字符串
30         NSRange rang3=[str3 rangeOfString:@"new"];      //查询字符串的位置
31         NSLog(@"%@",NSStringFromRange(rang3));      //显示字符串所在位置
32         if(rang3.location==NSNotFound){
33             NSLog(@"Can't find");
34         }
35         else{
36             NSLog(@"location=%ld,length=%ld",rang3.location,rang3.length);
37         }
38     }
39     return 0;
40 }