1.調用電話，調用短信，調用自帶瀏覽器

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.baidu.com"]];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://110:234234234"]];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms://10086"]];

2.調用相冊 使用圖片

"(void) buttonAction:(UIButton * )sender
{
    UIImagePickerController * imageController= [[UIImagePickerController alloc]init];
    
    imageController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; // 從相冊中拿.

    imageController.delegate = self;
    
    [self presentViewController:imageController animated:YES completion:^{
        NSLog(@""訪問相冊"");
    }];

}"
"(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    NSLog(@""%@"",info); // 這里的 info 取第二個,就是哪個經過修改后的圖片,選擇完成后,推出模態.
}"

3.UIAlertController

(void)viewDidLoad {
    [super viewDidLoad];
    // 第一步:這里安排一個按鈕.一點擊就彈出模態的 alertVIew.
    self.view.backgroundColor = [UIColor greenColor];
    self.button = [UIButton buttonWithType:(UIButtonTypeSystem)];
    _button.frame = CGRectMake(100,100, 100, 100);
    _button.backgroundColor = [UIColor purpleColor];
    [self.view addSubview:_button];

    [_button addTarget:self action:@selector(buttonAction:) forControlEvents:(UIControlEventTouchUpInside )];

    // 第二步 : 設置提示框.
    self.alertVC = [UIAlertController alertControllerWithTitle:@"提示" message:@"沒有輸入名字" preferredStyle:UIAlertControllerStyleAlert];

    // 第四步,可以從彈出來的模態哪個對話框中添加 textfiled. 用戶可以輸入一些東西,比如用戶名什么的.
    [_alertVC addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"請輸入名字";
    }];
    [_alertVC addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"請輸入密碼";
        textField.secureTextEntry = YES;
    }];

    // 第五步 :也可以在下面添加按鈕.并且以 block 的方式實現處理方法.
    UIAlertAction * action1 = [UIAlertAction actionWithTitle:@"取消" style:(UIAlertActionStyleCancel) handler:nil];
    UIAlertAction * action2 = [UIAlertAction actionWithTitle:@"確定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {
        NSLog(@"開始判定賬號密碼:");
    }];
    [_alertVC addAction:action1];
    [_alertVC  addAction:action2];
}

-(void) buttonAction:(UIButton * )sender
{
    // 第三步:點擊按鈕,觸發彈出模態.里面有UIalertController 控制器.注意這里不是 show, 從8.0以后才有的這個控件.
    NSLog(@"點擊了 button, 彈出了 alert1");
    [self presentViewController:_alertVC animated:YES completion:nil];
}

4.加速計，磁力針，陀螺儀。

5.程序間的通信，兩個程序相互跳轉

6.UISearchBar和 UISearchDisplayController的使用 + 謂詞

"  UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)];
  searchBar.placeholder = @""搜索"";
  [searchBar sizeToFit];
  searchBar.searchBarStyle = UISearchBarStyleProminent;
  // 添加 searchbar 到 headerview
  //    self.chatTableView.tableHeaderView = searchBar;
  // 用 searchbar 初始化 SearchDisplayController
  // 并把 searchDisplayController 和當前 controller 關聯起來
  self.searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:searchBar contentsController:self];
  // searchResultsDataSource 就是 UITableViewDataSource
  searchDisplayController.searchResultsDataSource = self;
  // searchResultsDelegate 就是 UITableViewDelegate
  searchDisplayController.searchResultsDelegate = self;"

7.webView

8.git :本地的版本控制.版本回滾.2.下代碼

9.cocopods

gem sources --remove https://tubygems.org/
gem sources -a http://ruby.taobao.org/
sudo gem install cocoapods
pod search AFNetworking // 搜索庫,名字是 AFNetworking
"platform :ios,'8.0'
pod 'AFNetworking', '~> 2.5.4'
pod 'Reachability', '~> 3.2'
pod 'FMDB', '~> 2.5'
pod 'LeanCloud', '~> 3.1.0'


pod 'SDWebImage', '~> 3.7.3'
pod 'shareSDK', '~> 0.0.2'

pod 'MagicalRecord', '~> 2.3.0'
pod 'MBProgressHUD', '~> 0.9.1'
 pod 'EGOTableViewPullRefresh', '~> 0.1.0'"

10.learncloud

// 創建
    AVObject *obj2 = [AVObject objectWithClassName:@"One"];
    // 添加
    [obj2 setObject:@"Nihao" forKey:@"greet"];
    [obj2 setObject:@(34) forKey:@"age"];
    NSLog(@"%@",obj2.objectId);

    // 保存/上傳
    [obj2 save]; // 同步的
    [obj2 saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (succeeded) {
            NSLog(@"數據上傳成功");
        }
        else
        {
            NSLog(@"上傳失敗");
        }
    }];

    // 下載
    AVQuery * query = [AVQuery queryWithClassName:@"One"];
    AVObject * obj3 = [query getObjectWithId:@"55a8ed8ce4b086039dd174f3"];
    NSLog(@"%@",[obj3 objectForKey:@"greet"]);

    AVUser * nowUser = [AVUser currentUser];
    NSLog(@"%@",nowUser);

    [AVUser logOut];
    nowUser = [AVUser currentUser];
    NSLog(@"%@",nowUser);


    // 創建用戶
    AVUser * user = [AVUser user];
    user.username = @"Lucidy";
    user.password = @"123456";
    user.mobilePhoneNumber = @"15652805835";

    // 用戶登錄.
    [user signUpInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (succeeded) {
            NSLog(@"注冊成功");
        }
        else
        {
            NSLog(@"注冊失敗:%@",error);
        }
    }];

    // 更改登錄用戶
    AVUser * NewUser = [AVUser logInWithUsername:@"Lucidy" password:@"123456" error:nil];
    NSLog(@"%@",NewUser);

11.reachability

12.sdwebimage