By

Contents
  1. 1. 遍历一个字典的key和value，不断的调用一个c函数，并传入一个Context实例
  2. 2. Context
  3. 3. 回调c函数
  4. 4. 示例
  5. 5. 类似还有CFArrayApplyFunction使用

遍历一个字典的key和value，不断的调用一个c函数，并传入一个Context实例

Context

1
2
3
4
typedef struct {
void* object;
void* value;
}MyConext;

回调c函数

1
2
3
4
5
static void MyContextCllbackFunc(const void *_key, const void *_value, void *context) {
NSLog(@"%@", _key);
NSLog(@"%@", _value);
NSLog(@"%p", context);
}

示例

1
2
3
4
5
6
7
8
9
10
11
12
13
NSDictionary *dict = @{
@"key1" : @"value",
@"key2" : @"value",
@"key3" : @"value",
};

User *user = [User new];

MyConext context = {0};
context.object = (__bridge void *)(user);
context.value = @"value";

CFDictionaryApplyFunction((CFDictionaryRef)dict, MyContextCllbackFunc, &context);

输出结果

1
2
3
4
5
6
7
8
9
2016-02-24 17:30:30.032 XZHRequest[34633:315777] key1
2016-02-24 17:30:30.032 XZHRequest[34633:315777] value
2016-02-24 17:30:30.032 XZHRequest[34633:315777] 0x7fff54de49e0
2016-02-24 17:30:30.033 XZHRequest[34633:315777] key3
2016-02-24 17:30:30.033 XZHRequest[34633:315777] value
2016-02-24 17:30:30.033 XZHRequest[34633:315777] 0x7fff54de49e0
2016-02-24 17:30:30.033 XZHRequest[34633:315777] key2
2016-02-24 17:30:30.033 XZHRequest[34633:315777] value
2016-02-24 17:30:30.033 XZHRequest[34633:315777] 0x7fff54de49e0

类似还有CFArrayApplyFunction使用

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
NSMutableArray *array = [NSMutableArray new];
for (int i = 0; i < 3; i++) {
User *user = [User new];
user.name = [NSString stringWithFormat:@"%d%d%d", i,i,i];
[array addObject:user];
}

//Context结构体实例  
MyConext context = {0};
context.object = @"hahaha";
context.value = @"hello world...";

//遍历Array数组元素，每一次传入一个函数中进行处理
CFArrayApplyFunction((CFArrayRef)array,
CFRangeMake(0, CFArrayGetCount((CFArrayRef)array)),
MyContextCllbackFunc2,
&context);

被回调的c函数

1
2
3
4
5
6
7
static void MyContextCllbackFunc2(const void *user, void *context) {
User *aUser = (__bridge User *)(user);
MyConext *ctx = context;

NSLog(@"aUser.name = %@", aUser.name);
NSLog(@"ctx = %p", ctx);
}

输出

1
2
3
4
5
6
2016-02-24 23:47:18.055 XZHRequest[3064:30469] aUser.name = 000
2016-02-24 23:47:18.055 XZHRequest[3064:30469] ctx = 0x7fff52afea18
2016-02-24 23:47:18.056 XZHRequest[3064:30469] aUser.name = 111
2016-02-24 23:47:18.056 XZHRequest[3064:30469] ctx = 0x7fff52afea18
2016-02-24 23:47:18.059 XZHRequest[3064:30469] aUser.name = 222
2016-02-24 23:47:18.059 XZHRequest[3064:30469] ctx = 0x7fff52afea18
Contents
  1. 1. 遍历一个字典的key和value，不断的调用一个c函数，并传入一个Context实例
  2. 2. Context
  3. 3. 回调c函数
  4. 4. 示例
  5. 5. 类似还有CFArrayApplyFunction使用