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 }
