OC字符串的替换与分割

 1 /**
 2  *  stringByReplacingOccurrencesOfString:字符串替换
 3  *  componentsSeparateByString:字符串切割
 4  *  enumerateObjectsUsingBlock打印数组元素
 5  */
 6 #import <Foundation/Foundation.h>
 7 
 8 int main(int argc, const char * argv[]) {
 9     @autoreleasepool {
10         //字符串替换
11         NSString *str=@"http:**www. bai du.com.ht ml*org";
12         //方式1:分步替换
13         str=[str stringByReplacingOccurrencesOfString:@" " withString:@""];//先将字符串中的空格替换为空
14         str=[str stringByReplacingOccurrencesOfString:@"*" withString:@"/"];//再将上步的基础上把*替换为/
15         
16         //方式2:一步到位
17         str=[[str stringByReplacingOccurrencesOfString:@" " withString:@""]     stringByReplacingOccurrencesOfString:@"*" withString:@"/"];//同上,将两步合并成一步处理
18         
19         NSLog(@"%@",str);//打印结果:http://www.baidu.com.html/org
20         
21         //使用componentsSeparateByString分割元素
22         NSArray *arry=[@"1,2,3,4,5" componentsSeparatedByString:@","];
23         //使用enumerateObjectsUsingBlock 打印数组元素
24         [arry enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
25             NSLog(@"%@,%lu",obj,idx) ;//打印结果:1,0 2,1 3,2 4,3 5,4
26         }];
27         
28         //去除首尾空格
29         NSString *str2=@" abcd ";
30         str2=[str2 stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
31         NSLog(@"%@",str2);//打印结果:abcd
32 
33         //使用执行字符串进行去除
34         NSString *str3=@"8abcd8";
35         str3=[str3 stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"8"]];
36         NSLog(@"%@",str3);//打印结果:abcd
37         
38         //去掉首尾小写字母
39         NSString *str4=@"Hello World";
40         str4=[str4 stringByTrimmingCharactersInSet:[NSCharacterSet lowercaseLetterCharacterSet]];
41         NSLog(@"%@",str4);//打印结果:Hello W
42 
43         NSString *str5=@"hello world";
44         str5=[str5 stringByTrimmingCharactersInSet:[NSCharacterSet lowercaseLetterCharacterSet]];
45         NSLog(@"%@",str5);//打印结果:
46         
47         //去掉首尾大写字母
48         NSString *str6=@"HelloD";
49         str6=[str6 stringByTrimmingCharactersInSet:[NSCharacterSet uppercaseLetterCharacterSet]];
50         NSLog(@"%@",str6);//打印结果:ello
51         
52         NSString *str7=@"Hello World";
53         str7=[str7 stringByTrimmingCharactersInSet:[NSCharacterSet uppercaseLetterCharacterSet]];
54         NSLog(@"%@",str7);//打印结果:ello World
55         
56         //去掉末尾指定字符/字符串
57         NSString *str8=@"Users/apple/desktop/";
58         str8=[str8 stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"/"]];
59         NSLog(@"%@",str8);//打印结果:Users/apple/desktop
60         
61     }
62     return 0;
63 }