Charles —— 青花瓷

• 网络抓包工具

• 可以拦截 iPhone/Android 手机中 App 的非加密网络请求数据

• 手机&电脑在同一个局域网

• 确保电脑能够通过路由器访问互联网

• 电脑安装 Charles

• 启动 Charles，禁用 MAC OS X Proxy & Mozilla FireFox Proxy

• 设置手机的网络代理

  • ip: 电脑的 ip
  • 端口: 8888

注意，如果让电脑通过手机的 3G 访问网络，无法拦截数据

拦截网易新闻数据

分类

URL

新闻首页

http://c.m.163.com/nc/article/headline/T1348647853363/0-20.html

科技

http://c.m.163.com/nc/article/list/T1348649580692/0-20.html

手机

http://c.m.163.com/nc/article/list/T1348649654285/0-20.html

移动互联

http://c.m.163.com/nc/article/list/T1351233117091/0-20.html

首页广告

http://c.m.163.com/nc/ad/headline/0-4.html

建立网络访问单例

+ (instancetype)sharedManager {
    static NetworkTools *instance;

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{

        // 注意：baseURL 应该以 / 结尾
        NSURL *baseURL = [NSURL URLWithString:@"http://c.m.163.com/nc/article/headline/"];
        NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];

        instance = [[self alloc] initWithBaseURL:baseURL sessionConfiguration:config];

    return instance;
}

加载新闻首页数据

- (void)loadData {
    [[NetworkTools sharedManager] GET:@"T1348647853363/0-20.html" parameters:nil success:^(NSURLSessionDataTask *task, id responseObject) {

        NSLog(@"%@ %@", responseObject, [responseObject class]);

    } failure:^(NSURLSessionDataTask *task, NSError *error) {
        NSLog(@"%@", error);
    }];
}

运行测试，statecode == 200，但是不支持数据格式 "text/html"

扩展反序列化格式类型

• 在 NetworkTools 单例中，扩展反序列化格式类型

  instance.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/html", nil];

字典使用技巧 － 取第一个键值内容

// 直接取出字典中第一个 key T1348647853363 对应的数组
NSArray *array = responseObject[responseObject.keyEnumerator.nextObject];
NSLog(@"%@", array);

新闻模型

.h

///  标题
@property (nonatomic, copy) NSString *title;
///  摘要
@property (nonatomic, copy) NSString *digest;
///  配图地址
@property (nonatomic, copy) NSString *imgsrc;

+ (instancetype)newsWithDict:(NSDictionary *)dict;

.m

+ (instancetype)newsWithDict:(NSDictionary *)dict {
    id obj = [[self alloc] init];

    [obj setValuesForKeysWithDictionary:dict];

    return obj;
}

字典转模型

NSMutableArray *arrayM = [NSMutableArray arrayWithCapacity:array.count];

[array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    [arrayM addObject:[News newsWithDict:obj]];
}];

NSLog(@"%@", arrayM);

运行测试－崩溃

• 因为网络字典中的属性键值比 News 模型中的属性多，直接使用 setValuesForKeysWithDictionary 方法会崩溃

修改新闻模型

+ (instancetype)newsWithDict:(NSDictionary *)dict {
    id obj = [[self alloc] init];

    NSArray *properties = [self properties];
    for (NSString *key in properties) {
        if (dict[key] != nil) {
            [obj setValue:dict[key] forKey:key];
        }
    }

    return obj;
}

+ (NSArray *)properties {
    return @[@"title", @"digest", @"imgsrc"];
}

增加 description

- (NSString *)description {
    NSDictionary *dict = [self dictionaryWithValuesForKeys:[News properties]];

    return [NSString stringWithFormat:@"<%@: %p> %@", self.class, self, dict];
}

利用运行时动态获取类属性

const char* propertiesKey = "propertiesKey";

+ (NSArray *)properties {
    NSMutableArray *arrayM = objc_getAssociatedObject(self, propertiesKey);
    if (arrayM != nil) {
        NSLog(@"返回关联数组");
        return arrayM;
    }

    NSLog(@"动态获取类属性");

    unsigned int count = 0;
    objc_property_t *ptys = class_copyPropertyList([self class], &count);

    arrayM = [NSMutableArray arrayWithCapacity:count];
    for (unsigned int i = 0; i < count; ++i) {
        objc_property_t pty = ptys[i];
        const char* cname = property_getName(pty);
        [arrayM addObject:[NSString stringWithUTF8String:cname]];
    }

    free(ptys);

    objc_setAssociatedObject(self, propertiesKey, arrayM, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

    return arrayM;
}