1 #import <Foundation/Foundation.h>
2
3 int main(int argc, const char * argv[]) {
4 @autoreleasepool {
5
6 //字典的使用
7
8 //创建字典对象
9 NSDictionary * a1 = [NSDictionary
dictionaryWithObjectsAndKeys:@"one",@"1",@"two",@"2",@"three",@"3", nil];
10 NSLog(@"%@",a1);
11
12
13 NSDictionary *a3 = [[NSDictionary alloc]
initWithObjectsAndKeys:@"hu",@"name",@"23",@"age", nil];
14 NSDictionary *a4 = [NSDictionary dictionaryWithDictionary:a1];
15 NSLog(@"%@ %@ %@",a1,a3,a4);
16
17
18 //获取所有key值,获取所有value值
19 NSLog(@"%@ %@",[a1 allKeys],[a1 allValues]);
20
21
22 //通过key值查询value
23
24 NSLog(@"%@",[a1 objectForKey:@"2"]);
25
26
27 //获取值的个数
28 NSLog(@"%lu",[a1 count]);
29
30
31
32
33
34 //不可变字典 NSMutableDictionary
35
36
37 //定义不可变字典
38
39 NSMutableDictionary *dic = [NSMutableDictionary
dictionaryWithObjectsAndKeys:@"xiaoge",@"name",@"18",@"age",@"nan",@"sex", nil];
40 NSLog(@"%@",dic);
41
42 NSMutableDictionary *dic1 = [NSMutableDictionary
dictionaryWithObjects:[NSArray arrayWithObjects:@"cheng",@"deng",@"hui", nil]
forKeys:[NSArray arrayWithObjects:@"1",@"2",@"3", nil]];
43 NSLog(@"%@",dic1);
44 NSMutableDictionary *dic2 = [NSMutableDictionary dictionaryWithDictionary:dic];
45 NSLog(@"%@",dic2);
46
47
48 //增添键值对
49
50 [dic setObject:@"five" forKey:@"5"];
51 NSLog(@"%@",dic);
52
53
54 //删除键值对
55
56 [dic removeObjectForKey:@"5"];
57 NSLog(@"%@",dic);
58
59 //更改键值对
60 NSMutableDictionary *a5 = [[NSMutableDictionary alloc]
initWithObjects:[NSArray arrayWithObjects:@"one",@"two",@"three", nil]
forKeys:[NSArray arrayWithObjects:@"1",@"2",@"3", nil]];
61 NSLog(@"%@",a5);
62
63 [a5 setObject:@"six" forKey:@"1"];
64 NSLog(@"%@",a5);
65
66 /*
67 ----------------------------------------------
68
69 集合(NSSet)
70 ----------------------------------------------
71
72 */
73
74
75 //定义集合
76 NSSet *set = [[NSSet alloc] initWithObjects:@"one",@"two",@"three", nil];
77
78 NSLog(@"%@",set);
79
80 //判断是否为集合中的元素
81 NSLog(@"%@",[set member:@"one"]);
82
83 //打印出来总打印顺序的第一个
84 NSLog(@"%@",[set anyObject]);
85
86
87 //打印出来所有元素
88 NSLog(@"%@",[set allObjects]);
89
90 //打印出元素个数
91 NSLog(@"%lu",(unsigned long)[set count]);
92
93
94 //判断集合是否包含这个元素(返回值为1或0)
95 BOOL ret = [set containsObject:@"one"];
96 NSLog(@"%hhd",ret);
97
98 //判断两个集合是否相等
99 NSSet *set1 = [NSSet setWithObjects:@"one",@"two",@"three", nil];
100 BOOL r = [set isEqualTo:set1];
101 NSLog(@"%hhd",r);
102
103
104
105 /*
106 可变集合(NSMutableSet)
107
108 */
109
110 //定义可变集合
111 //利用一个集合创建另一个集合
112 NSMutableSet * set2 = [NSMutableSet setWithSet:set];
113 NSLog(@"%@",set2);
114 NSMutableSet *set3 = [NSMutableSet setWithObjects:@"one",@"two",@"three", nil];
115 //添加数组元素(重复的只保留一次)
116 [set3 addObject:@"four"];
117 [set3 addObject:@"five"];
118 NSLog(@"%@",set3);
119
120 //删除元素
121 [set3 removeObject:@"four"];
122 NSLog(@"%@",set3);
123
124 //打印出集合中的所有元素
125 NSLog(@"%@",[set3 allObjects]);
126
127 //求两个集合的并集
128 [set3 unionSet:set2];
129 NSLog(@"%@",set3);
130
131 //求两个集合的交集
132 [set3 minusSet:set2];
133 NSLog(@"%@",set3);
134
135 //可变数组中国重新定义这个集合(相当于替换)
136 [set2 setSet:[NSSet setWithObjects:@"1",@"2",@"3", nil]];
137 NSLog(@"%@",set2);
138
139
140
141
142
143 /*
144
145 --------------------------------------
146 快速遍历的方法总结
147
148 --------------------------------------
149
150 */
151 //数组的快速遍历(得到的是数组中的元素对象)
152 NSArray *a = [NSArray arrayWithObjects:@"12",@"34",@"56", nil];
153 for(id a1 in a)
154 {
155 NSLog(@"%@",a1);
156 }
157
158 //字典的快速遍历(遍历得到的是字典中的key值)
159 NSDictionary *b = [NSDictionary
dictionaryWithObjectsAndKeys:@"one",@"1",@"two",@"2",@"three",@"3", nil];
160 for(id b1 in b)
161 {
162 NSLog(@"%@",b1);
163
164 }
165
166 //集合的快速遍历(得到的是集合的元素对象)
167 NSSet *c = [NSSet setWithObjects:@"one"@"four"@"two", nil];
168 for(id c1 in c)
169 {
170 NSLog(@"%@",c1);
171
172 }
173
174 /*
175
176 ---------------------------------------------
177
178 oc中的数组排序(类似于冒泡排序)
179
180 ---------------------------------------------
181
182 */
183 //oc中的冒泡排序
184 NSMutableArray *a2 = [NSMutableArray arrayWithObjects:@"12",@"34",@"56", nil];
185 for (int i=0; i<[a2 count]-1; i++) {
186 for (int j=0; j<[a2 count]-1-i; j++) {
187 if ([[a2 objectAtIndex:j] compare:[a2 objectAtIndex:j+1]]) {
188 [a2 exchangeObjectAtIndex:j withObjectAtIndex:j+1];
189 }
190 }
191 }
192 NSLog(@"%@",a2);
193
194
195
196 //数组中转化为整型然后比较
197 NSMutableArray * array = [NSMutableArray arrayWithObjects:
198 [NSNumber numberWithInt:12],
199 [NSNumber numberWithInt:70],
200 [NSNumber numberWithInt:34],
201 [NSNumber numberWithInt:37],
202 [NSNumber numberWithInt:50],
203 [NSNumber numberWithInt:90],
204 [NSNumber numberWithInt:21],
205 [NSNumber numberWithInt:3],
206 [NSNumber numberWithInt:68],
207 [NSNumber numberWithInt:1], nil];
208 //注意要他们相应的转化为整型值,然后比较
209 for (int i=0; i<[array count]; i++) {
210 for (int j=0; j<[array count]-1-i; j++) {
211 if ([[array objectAtIndex:j] intValue]<[[array objectAtIndex:j+1]
integerValue]) {
212 [array exchangeObjectAtIndex:j withObjectAtIndex:j+1];
213 }
214 }
215 }
216 NSLog(@"%@",array);
217
218
219 /*
220 ----------------------------------
221 数组默认排序的使用
222 @selector 获取方法名,这个方法名是数组元素的方法
223 -----------------------------------
224 */
225 NSMutableArray *arr = [NSMutableArray arrayWithObjects:@"ae",@"be",@"ce", nil];
226 NSArray *arr1 = [arr sortedArrayUsingSelector:@selector(compare:)];
227 NSLog(@"%@",arr1);
228
229 [arr sortUsingSelector:@selector(compare:)];
230 NSLog(@"%@",arr);
231