基本控件 - 简书

隐藏和显示导航

第一种做法
注意这里一定要用动画的方式隐藏导航栏,这样在使用滑动返回手势的时候效果最好,和上面动图一致.这样做有一个缺点就是在切换tabBar的时候有一个导航栏向上消失的动画.

- (void)viewWillAppear:(BOOL)animated {   
  [superviewWillAppear:animated];    
  [self.navigationController setNavigationBarHidden:YESanimated:YES];
}

- (void)viewWillDisappear:(BOOL)animated {   
  [superviewWillDisappear:animated];    
  [self.navigationController setNavigationBarHidden:NOanimated:YES];
}

第二种做法
设置self为导航控制器的代理,实现代理方法,在将要显示控制器中设置导航栏隐藏和显示,使用这种方式不仅完美切合滑动返回手势,同时也解决了切换tabBar的时候,导航栏动态隐藏的问题.

@interfaceWLHomePageController()
@end
@implementationWLHomePageController#pragma
mark - lifeCycle
- (void)viewDidLoad {   
  [superviewDidLoad];
  // 设置导航控制器的代理为
  selfself.navigationController.delegate=self;
}
#pragma mark - UINavigationControllerDelegate
// 将要显示控制器
- (void)navigationController:(UINavigationController*)navigationController willShowViewController:(UIViewController*)viewController animated:(BOOL)animated {
  // 判断要显示的控制器是否是自己
  BOOLisShowHomePage = [viewController isKindOfClass:[selfclass]];    
  [self.navigationController setNavigationBarHidden:isShowHomePage animated:YES];
}

//提示框

image

// 初始化对话框
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"用户名或密码错误，请检查后重新登录！" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                    [self.navigationController popViewControllerAnimated:YES];
                }]];
// 弹出对话框
[self presentViewController:alert animated:true completion:nil];

image

// 初始化对话框
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"确认注销吗？" preferredStyle:UIAlertControllerStyleAlert];
// 确定注销
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *_Nonnull action) {
                    // 1.清除用户名、密码的存储
                    // 2.跳转到登录界面
                    [self performSegueWithIdentifier:@"Logout" sender:nil];
                }];
UIAlertAction *cancelAction =[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
[alert addAction:okAction];
[alert addAction:cancelAction];
 // 弹出对话框
[self presentViewController:alert animated:true completion:nil];

image

 //提示框添加文本输入框
UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title" message:@"This is an alert." preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
                                                     handler:^(UIAlertAction * action) {
                                                         //响应事件
                                                         //得到文本信息
                                                         for(UITextField *text in alert.textFields){
                                                             NSLog(@"text = %@", text.text);
                                                         }
                                                     }];
UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel
                                                         handler:^(UIAlertAction * action) {
                                                             //响应事件
                                                             NSLog(@"action = %@", alert.textFields);
                                                         }];
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"登录";
}];
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
   textField.placeholder = @"密码";
   textField.secureTextEntry = YES;
}];
[alert addAction:okAction];
[alert addAction:cancelAction];
[self presentViewController:alert animated:YES completion:nil];

image

//显示弹出框列表选择  
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Title" message:@"This is an Sheet." preferredStyle:UIAlertControllerStyleActionSheet];  
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel  
 handler:^(UIAlertAction * action) {  
//响应事件  
NSLog(@"action = %@", action);  
}];  
UIAlertAction* deleteAction = [UIAlertAction actionWithTitle:@"删除" style:UIAlertActionStyleDestructive  
 handler:^(UIAlertAction * action) {  
//响应事件  
NSLog(@"action = %@", action);  
}];  
UIAlertAction* saveAction = [UIAlertAction actionWithTitle:@"保存" style:UIAlertActionStyleDefault  
 handler:^(UIAlertAction * action) {  
//响应事件  
NSLog(@"action = %@", action);  
}];  
[alert addAction:saveAction];  
[alert addAction:cancelAction];  
[alert addAction:deleteAction];  
[self presentViewController:alert animated:YES completion:nil];

//报警告
//Initializing 'AppDelegate *__strong' with an expression of incompatible type 'id _Nullable'
AppDelegate *app = (AppDelegate *)[UIApplication sharedApplication].delegate;
app.window.rootViewController = app.drawerController;

//xib设置圆角需要到的Key Path：
layer.cornerRadius ，注意该 key 对应 Value 的 type 应该设置为 String
layer.masksToBounds ,注意该 key 对应 Value 的 type 应该设置为 Boolean , 当右侧出现对号时为YES

//这个方法允许你在显示app给用户之前执行最后的初始化操作
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
if (@available(iOS 11.0, *)){//避免滚动视图顶部出现20的空白以及push或者pop的时候页面有一个上移或者下移的异常动画的问题
        [[UIScrollView appearance] setContentInsetAdjustmentBehavior:UIScrollViewContentInsetAdjustmentNever];
    }
    return YES;
}