IOS第三天-新浪微博 - 版本新特性，OAuth授权认证

*********版本新特性

#import "HWNewfeatureViewController.h"
#import "HWTabBarViewController.h"
#define HWNewfeatureCount 4

@interface HWNewfeatureViewController () <UIScrollViewDelegate>
@property (nonatomic, weak) UIPageControl *pageControl;

@property (nonatomic, weak) UIScrollView *scrollView;
@end

@implementation HWNewfeatureViewController
- (void)viewDidLoad
{
    [super viewDidLoad];
    // 1.创建一个scrollView：显示所有的新特性图片
    UIScrollView *scrollView = [[UIScrollView alloc] init];
    scrollView.frame = self.view.bounds;
    [self.view addSubview:scrollView];
    self.scrollView = scrollView;
    
    // 2.添加图片到scrollView中
    CGFloat scrollW = scrollView.width;
    CGFloat scrollH = scrollView.height;
    for (int i = 0; i<HWNewfeatureCount; i++) {
        UIImageView *imageView = [[UIImageView alloc] init];
        imageView.width = scrollW;
        imageView.height = scrollH;
        imageView.y = 0;
        imageView.x = i * scrollW;
        // 显示图片
        NSString *name = [NSString stringWithFormat:@"new_feature_%d", i + 1];
        imageView.image = [UIImage imageNamed:name];
        [scrollView addSubview:imageView];
        
        // 如果是最后一个imageView，就往里面添加其他内容
        if (i == HWNewfeatureCount - 1) {
            [self setupLastImageView:imageView];
        }
    }
    
#warning 默认情况下，scrollView一创建出来，它里面可能就存在一些子控件了
#warning 就算不主动添加子控件到scrollView中，scrollView内部还是可能会有一些子控件
    
    // 3.设置scrollView的其他属性
    // 如果想要某个方向上不能滚动，那么这个方向对应的尺寸数值传0即可
    scrollView.contentSize = CGSizeMake(HWNewfeatureCount * scrollW, 0);
    scrollView.bounces = NO; // 去除弹簧效果
    scrollView.pagingEnabled = YES;
    scrollView.showsHorizontalScrollIndicator = NO;
    scrollView.delegate = self;
    
    // 4.添加pageControl：分页，展示目前看的是第几页
    UIPageControl *pageControl = [[UIPageControl alloc] init];
    pageControl.numberOfPages = HWNewfeatureCount;
    pageControl.backgroundColor = [UIColor redColor];
    pageControl.currentPageIndicatorTintColor = HWColor(253, 98, 42);
    pageControl.pageIndicatorTintColor = HWColor(189, 189, 189);
    pageControl.centerX = scrollW * 0.5;
    pageControl.centerY = scrollH - 50;
    [self.view addSubview:pageControl];
    self.pageControl = pageControl;
    
    // UIPageControl就算没有设置尺寸，里面的内容还是照常显示的
    //    pageControl.width = 100;
    //    pageControl.height = 50;
    //    pageControl.userInteractionEnabled = NO;
    
//    UITextField *text = [[UITextField alloc] init];
//    text.frame = CGRectMake(10, 20, 100, 50);
//    text.borderStyle = UITextBorderStyleRoundedRect;
//    [self.view addSubview:text];
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    double page = scrollView.contentOffset.x / scrollView.width;
    // 四舍五入计算出页码
    self.pageControl.currentPage = (int)(page + 0.5);
    // 1.3四舍五入 1.3 + 0.5 = 1.8 强转为整数(int)1.8= 1
    // 1.5四舍五入 1.5 + 0.5 = 2.0 强转为整数(int)2.0= 2
    // 1.6四舍五入 1.6 + 0.5 = 2.1 强转为整数(int)2.1= 2
    // 0.7四舍五入 0.7 + 0.5 = 1.2 强转为整数(int)1.2= 1
}

/**
 *  初始化最后一个imageView
 *
 *  @param imageView 最后一个imageView
 */
- (void)setupLastImageView:(UIImageView *)imageView
{
    // 开启交互功能
    imageView.userInteractionEnabled = YES;
    
    // 1.分享给大家（checkbox）
    UIButton *shareBtn = [[UIButton alloc] init];
    [shareBtn setImage:[UIImage imageNamed:@"new_feature_share_false"] forState:UIControlStateNormal];
    [shareBtn setImage:[UIImage imageNamed:@"new_feature_share_true"] forState:UIControlStateSelected];
    [shareBtn setTitle:@"分享给大家" forState:UIControlStateNormal];
    [shareBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    shareBtn.titleLabel.font = [UIFont systemFontOfSize:15];
    shareBtn.width = 200;
    shareBtn.height = 30;
    shareBtn.centerX = imageView.width * 0.5;
    shareBtn.centerY = imageView.height * 0.65;
    [shareBtn addTarget:self action:@selector(shareClick:) forControlEvents:UIControlEventTouchUpInside];
    [imageView addSubview:shareBtn];
//    shareBtn.backgroundColor = [UIColor redColor];
//    shareBtn.imageView.backgroundColor = [UIColor blueColor];
//    shareBtn.titleLabel.backgroundColor = [UIColor yellowColor];
    
    // top left bottom right
    
    // EdgeInsets: 自切
    // contentEdgeInsets:会影响按钮内部的所有内容（里面的imageView和titleLabel）
    //    shareBtn.contentEdgeInsets = UIEdgeInsetsMake(10, 100, 0, 0);
    
    // titleEdgeInsets:只影响按钮内部的titleLabel
    shareBtn.titleEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);
    
    // imageEdgeInsets:只影响按钮内部的imageView
//    shareBtn.imageEdgeInsets = UIEdgeInsetsMake(20, 0, 0, 50);
    
    
    
//    shareBtn.titleEdgeInsets
//    shareBtn.imageEdgeInsets
//    shareBtn.contentEdgeInsets
    
    // 2.开始微博
    UIButton *startBtn = [[UIButton alloc] init];
    [startBtn setBackgroundImage:[UIImage imageNamed:@"new_feature_finish_button"] forState:UIControlStateNormal];
    [startBtn setBackgroundImage:[UIImage imageNamed:@"new_feature_finish_button_highlighted"] forState:UIControlStateHighlighted];
    startBtn.size = startBtn.currentBackgroundImage.size;
    startBtn.centerX = shareBtn.centerX;
    startBtn.centerY = imageView.height * 0.75;
    [startBtn setTitle:@"开始微博" forState:UIControlStateNormal];
    [startBtn addTarget:self action:@selector(startClick) forControlEvents:UIControlEventTouchUpInside];
    [imageView addSubview:startBtn];
}

- (void)shareClick:(UIButton *)shareBtn
{
    // 状态取反
    shareBtn.selected = !shareBtn.isSelected;
}

- (void)startClick
{
    // 切换到HWTabBarController
    /*
     切换控制器的手段
     1.push：依赖于UINavigationController，控制器的切换是可逆的，比如A切换到B，B又可以回到A
     2.modal：控制器的切换是可逆的，比如A切换到B，B又可以回到A
     3.切换window的rootViewController
     */
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    window.rootViewController = [[HWTabBarViewController alloc] init];
    
    // modal方式，不建议采取：新特性控制器不会销毁
//    HWTabBarViewController *main = [[HWTabBarViewController alloc] init];
//    [self presentViewController:main animated:YES completion:nil];
}

- (void)dealloc
{
    HWLog(@"HWNewfeatureViewController-dealloc");
}

/*
 1.程序启动会自动加载叫做Default的图片
 1> 3.5inch 非retain屏幕：Default.png
 2> 3.5inch retina屏幕：Default@2x.png
 3> 4.0inch retain屏幕: Default-568h@2x.png

 2.只有程序启动时自动去加载的图片, 才会自动在4inch retina时查找-568h@2x.png
 */

/*
 一个控件用肉眼看不见，有哪些可能
 1.根本没有创建实例化这个控件
 2.没有设置尺寸
 3.控件的颜色跟父控件的背景色一样（实际上已经显示了，只不过用肉眼看不见）
 4.透明度alpha <= 0.01
 5.hidden = YES
 6.没有添加到父控件中
 7.被其他控件挡住了
 8.位置不对
 9.父控件发生了以上情况
 10.特殊情况
 * UIImageView没有设置image属性，或者设置的图片名不对
 * UILabel没有设置文字，或者文字颜色和跟父控件的背景色一样
 * UITextField没有设置文字，或者没有设置边框样式borderStyle
 * UIPageControl没有设置总页数，不会显示小圆点
 * UIButton内部imageView和titleLabel的frame被篡改了，或者imageView和titleLabel没有内容
 * .....
 
 添加一个控件的建议（调试技巧）：
 1.最好设置背景色和尺寸
 2.控件的颜色尽量不要跟父控件的背景色一样
 */
@end

**********HWNewfeatureViewController .h

#import <UIKit/UIKit.h>

@interface HWNewfeatureViewController : UIViewController

@end

 ************OAuth授权认证

#import "HWOAuthViewController.h"
#import "AFNetworking.h"

@interface HWOAuthViewController () <UIWebViewDelegate>

@end

@implementation HWOAuthViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // 1.创建一个webView
    UIWebView *webView = [[UIWebView alloc] init];
    webView.frame = self.view.bounds;
    webView.delegate = self;
    [self.view addSubview:webView];
    
    // 2.用webView加载登录页面（新浪提供的）
    // 请求地址：https://api.weibo.com/oauth2/authorize
    /* 请求参数：
     client_id    true    string    申请应用时分配的AppKey。
     redirect_uri    true    string    授权回调地址，站外应用需与设置的回调地址一致，站内应用需填写canvas page的地址。
    */
    NSURL *url = [NSURL URLWithString:@"https://api.weibo.com/oauth2/authorize?client_id=3235932662&redirect_uri=http://"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [webView loadRequest:request];
}

#pragma mark - webView代理方法
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
//    HWLog(@"----webViewDidFinishLoad");
}

- (void)webViewDidStartLoad:(UIWebView *)webView
{
//    HWLog(@"----webViewDidStartLoad");
}

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    // 1.获得url
    NSString *url = request.URL.absoluteString;
    
    // 2.判断是否为回调地址
    NSRange range = [url rangeOfString:@"code="];
    if (range.length != 0) { // 是回调地址
        // 截取code=后面的参数值
        int fromIndex = range.location + range.length;
        NSString *code = [url substringFromIndex:fromIndex];
        
        // 利用code换取一个accessToken
        [self accessTokenWithCode:code];
    }
    
    return YES;
}

/**
 *  利用code（授权成功后的request token）换取一个accessToken
 *
 *  @param code 授权成功后的request token
 */
- (void)accessTokenWithCode:(NSString *)code
{
/*
 URL：https://api.weibo.com/oauth2/access_token
 
 请求参数：
 client_id：申请应用时分配的AppKey
 client_secret：申请应用时分配的AppSecret
 grant_type：使用authorization_code
 redirect_uri：授权成功后的回调地址
 code：授权成功后返回的code
 */
    // 1.请求管理者
    AFHTTPRequestOperationManager *mgr = [AFHTTPRequestOperationManager manager];
//    mgr.responseSerializer = [AFJSONResponseSerializer serializer];
    
    // AFN的AFJSONResponseSerializer默认不接受text/plain这种类型
    
    // 2.拼接请求参数
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    params[@"client_id"] = @"3235932662";
    params[@"client_secret"] = @"227141af66d895d0dd8baca62f73b700";
    params[@"grant_type"] = @"authorization_code";
    params[@"redirect_uri"] = @"http://";
    params[@"code"] = code;
    
    // 3.发送请求
    [mgr POST:@"https://api.weibo.com/oauth2/access_token" parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {
        HWLog(@"请求成功-%@", responseObject);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        HWLog(@"请求失败-%@", error);
    }];
}
@end

***

#import <UIKit/UIKit.h>

@interface HWOAuthViewController : UIViewController

@end