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Objective-c 集合对象(一)
2017-10-12 18:17:06 】 浏览:7735
Tags:Objective-c 集合 对象

  集合(NSSet)是一组单值对象的组合,集合对象的操作包括:搜索,添加,删除集合中的成员(可变集合的功能),比较两个集合,计算两个集合的交集,并集等。

  下面来看下(NSSet)的方法:

  

 

 

  1)集合的构建

  

 1 // 构建集合的三种方法
 2 
 3 #import <Foundation/Foundation.h>
 4 
 5 int main(int argc , const char *argv[]){
 6     @autoreleasepool {
 7         NSSet *set1 = [NSSet setWithObjects:@"zhangsan",@"lisi",@"wangwu",nil];
 8         for(NSString *temp1 in set1){
 9             NSLog(@"temp1 = %@",temp1);
10         }
11         
12         NSArray *array = @[@"aa",@"bb",@"cc"];
13         NSSet *set2 = [NSSet setWithArray:array];
14         for(NSString *temp2 in set2)
15             NSLog(@"temp2 = %@",temp2);
16         
17         NSSet *set3 = [[NSSet alloc] initWithObjects:@"aa",@"bb"@"cc",nil];
18         for(NSString *temp3 in set3)
19             NSLog(@"temp3 = %@",temp3);
20     }
21 }

  2)集合的遍历

  

 1 #import <Foundation/Foundation.h>
 2 
 3 @interface NSString (print)
 4 
 5 - (void)print;
 6 - (void)show:(NSString *)str;
 7 
 8 @end
 9 
10 @implementation NSString (print)
11 
12 - (void)print{
13     NSLog(@"%@",self);
14 }
15 - (void)show:(NSString *)str{
16     NSLog(@"%@ : %@",str,self);
17 }
18 
19 @end
20 int main(int argc , const char *argv[]){
21     @autoreleasepool {
22         NSSet *set = [NSSet setWithObjects:@"zhangsan",@"lisi",@"wangwu",nil];
23         for(NSString *temp in set)
24             NSLog(@"temp = %@",temp);
25         
26         NSLog(@"--------------------------");
27         [set enumerateObjectsUsingBlock:^(id obj, BOOL *stop) {
28             NSLog(@"obj = %@",obj);
29         }];
30         
31         NSLog(@"---------------------------");
32         [set makeObjectsPerformSelector:@selector(print)];
33         
34         NSLog(@"----------------------------");
35         [set makeObjectsPerformSelector:@selector(show:) withObject:@"this is "];
36         
37         NSLog(@"-----------------------------");
38         NSEnumerator *emr = [set objectEnumerator];
39         NSString *temp = nil;
40         while(temp = [emr nextObject])
41             NSLog(@"temp = %@",temp);
42     }
43     return 0;
44 }

 

 3) 集合的比较

  

 1 #import <Foundation/Foundation.h>
 2 
 3 int main(int argc , const char *argv[]){
 4     @autoreleasepool {
 5         NSSet *set = [NSSet setWithObjects:@"zhangsan",@"lisi",@"wangwu",nil];
 6         for(NSString *temp in set)
 7             NSLog(@"temp = %@",temp);
 8         
 9         BOOL ishas = [set containsObject:@"lisi"];
10         if(ishas)
11             NSLog(@"has lisi");
12         else
13             NSLog(@"no lisi");
14         
15         NSString *str = [set member:@"aaaa"];
16         NSLog(@"str = %@",str);
17         
18         NSSet *set2 = [set setByAddingObject:@"xiaoliu"];
19         NSLog(@"set2 = %@",set2);
20         
21         NSSet *set3 = [set setByAddingObjectsFromArray:@[@"aa",@"bb",@"cc"]];
22         NSLog(@"set3 = %@",set3);
23         
24         NSSet *set4 = [NSSet setWithObjects:@"zhangsan",@"lisi",nil];
25         BOOL issub = [set4 isSubsetOfSet:set];
26         if(issub)
27             NSLog(@"set4 is set sub class");
28         else
29             NSLog(@"set4 no set sub class");
30         
31         BOOL isinterset = [set intersectsSet:set4];
32         if(isinterset)
33             NSLog(@"set and set4 has in
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