1 NSArray *cityArray = [NSArray arrayWithObjects:@"中国北京",@"中国郑州",@"中国洛阳",@"中国杭州",@"中国香港",@"中国台湾", nil];
2 NSDictionary *personInforDic = [NSDictionary dictionaryWithObjectsAndKeys:@"zhangsan",@"name",@"nan",@"sex",[NSNumber numberWithInt:28],@"age",nil];
3 NSSet *stringSet = [NSSet setWithObjects:@"123",@"456",@"789",@"0X0",nil];
4 //
5 /*
6 for循环遍历
7 */
8 //遍历数组
9 for(int i = 0;i < cityArray.count;i++){
10 NSString *string = [cityArray objectAtIndex:i];
11 NSLog(@"cityArray[%d] = %@",i,string);
12 }
13 //遍历字典
14 NSArray *keys = [personInforDic allKeys];
15 for (int i = 0; i < personInforDic.count; i++) {
16 NSString *key = [keys objectAtIndex:i ];
17 NSString *value = [personInforDic valueForKey:key];
18 NSLog(@"%@ = %@",key,value);
19 }
20 //遍历集合
21 NSArray *setObject = [stringSet allObjects];
22 for (int i = 0; i < stringSet.count; i++) {
23 NSLog(@"%@",[setObject objectAtIndex:i]);
24 }
25
26 /*
27 NSEnumerator
28 */
29 //NSEnumerator 数组----正序遍历
30 NSEnumerator *arrEnu = [cityArray objectEnumerator];
31
32 id value = nil;
33 while (value = [arrEnu nextObject]) {
34 NSLog(@"%@",value);
35 }
36 NSLog(@"------------------");
37 //NSEnumerator 数组----倒序遍历
38 NSEnumerator *arrayEnu = [cityArray reverseObjectEnumerator];
39 id value1 = nil;
40 while (value1 = [arrayEnu nextObject]) {
41 NSLog(@"%@",value1);
42 }
43
44 //NSEnumerator 字典
45 NSEnumerator *arrEnu1 = [personInforDic objectEnumerator];
46
47 id value2 = nil;
48 while (value2 = [arrEnu1 nextObject]) {
49 NSLog(@"%@",value2);
50 }
51 //NSEnumerator 集合
52 NSEnumerator *setEnu = [stringSet objectEnumerator];
53 id value3 = nil;
54 while (value3 = [setEnu nextObject]) {
55 NSLog(@"%@",value3);
56 }
57 /*
58 for----in 遍历
59 */
60 //for----in 遍历数组
61 for (NSString *cityName in cityArray) {
62 NSLog(@"cityName = %@",cityName);
63 }
64 //for----in 遍历字典
65 for (NSString *key in personInforDic) {
66 NSLog(@"%@ = %@",key,[personInforDic objectForKey:key]);
67 }
68 //for----in 遍历集合
69 for (NSString *ss in setEnu) {
70 NSLog(@"%@",ss);
71 }
72 //
73 #pragma mark------数组排序---------
74
75
76 //创建一个可变数组
77 // NSMutableArray *sortArray = [NSMutableArray arrayWithObjects:@"aa",@"bb",@"cc",@"ee",@"dd", nil];
78 // for (int i = 0; i < sortArray .count - 1; i++) {
79 // for (int k = 0; k < sortArray.count - i - 1; k++) {
80 // if ([sortArray[k] compare:sortArray[k+1]] > 0) {
81 // [sortArray exchangeObjectAtIndex:k withObjectAtIndex:k+1];
82 // }
83 // }
84 // }
85 // NSLog(@"%@",sortArray);
86 //sortedArrayUsingSelector 是有返回值的,返回值是排序之后的数组
87 // NSArray *sortArray1 = [sortArray sortedArrayUsingSelector:@selector(compare:)];
88 // NSLog(@"%@",sortArray1);
89 // //sortUsingSelector 这是一个没有返回值的,改变的就是调用这个方法的数组的本身
90 // [sortArray sortUsingSelector:@selector(compare:)];
91 // NSLog(@"%@",sortArray);
92 // //降序排序
93 // NSMutableArray *array = [NSMutableArray array];
94 // //上面的语句相当于 NSMutableArray *array = [[NSMutableArray alloc] init];
95 // for (NSInteger i = sortArray.count - 1 ; i >= 0; i--) {
96 // [array addObject:sortArray[i]];
97 // }
98 // NSLog(@"%@",array);
99 /*
100 数组排序 ------数组中存放自定义类的对象
101 */
102 Person *per1 = [Person personWithName:@"zhang1" Age:18 Sex:@"nan"];
103 Person *per2 = [Person personWithName:@"zhang2" Age:19 Sex:@"nan"];
104 Person *per3 = [Person personWithName:@"zhang3" Age:20 Sex:@"nan"];
105 Person *per4 = [Person personWithName:@"zhang4" Age:21 Sex:@"nan"];
106 Person *per5 = [Person personWithName:@"zhang5" Age:22 Sex:@"nan"];
107
108 //根据多个person对象,生成数组
109 NSArray *personArray = [NSArray arrayWithObjects:per1,per2,per3,per4,per5, nil];
110 // //不可变数组排序
111 // //生成排序描述符
112 // NSSortDescriptor *sortName = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
113 // //通过排序描述符对数组进行排序,生成新的数组
114 // NSArray *sortedName = [personArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortName]];
115 // NSLog(@"%@",sortedName);
116 // //按照年龄降序排序
117 // NSSortDescriptor *sortAge = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:NO];
118 // NSArray *sortedAge = [personArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortAge]];
119 // NSLog(@"%@",sortedAge);
120 //可变数组
121 NSMutableArray *marray = [personArray mutableCopy];
122
123 //生成排序描述符 --------按人的姓名降序
124 NSSortDescriptor *sortWithName = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:NO];
125
126 //通过排序描述符对数组进行排序
127 [marray sortUsingDescriptors:[NSArray arrayWithObject: sortWithName]];
128 NSLog(@"%@",marray);
