核心动画的使用 - 启动动画

1、启动动画

• 1.1 CHWelcomeView.h

  @interface CHWelcomeView : UIView
  
  /// 创建欢迎视图
  + (instancetype)weicomeView;
  
  @end

• 1.2 CHWelcomeView.m

  @interface CHWelcomeView ()
  
  @property (weak, nonatomic) IBOutlet UIImageView *backView;
  
  @property (weak, nonatomic) IBOutlet UIImageView *sloganView;
  
  @property (weak, nonatomic) IBOutlet UIImageView *iconView;
  
  @property (weak, nonatomic) IBOutlet UILabel *textView;
  
  @end
  
  @implementation CHWelcomeView
  
  /// 创建欢迎视图
  + (instancetype)weicomeView{
      return [[NSBundle mainBundle] loadNibNamed:NSStringFromClass(self) owner:nil options:nil].firstObject;
  }
  
  /// 初始化
  - (void)awakeFromNib {
      [super awakeFromNib];
  
      self.backView.image = [UIImage imageNamed:@"ad_background"];
  
      self.sloganView.image = [UIImage imageNamed:@"compose_slogan"];
      self.iconView.image = [UIImage imageNamed:@"QianChia0123"];
  
      self.textView.text = @"欢迎回来";
  }
  
  /// 已经添加到父视图上
  - (void)didMoveToSuperview {
  
      [super didMoveToSuperview];
  
      // 设置头像圆角
      self.iconView.layer.cornerRadius = 50;
      self.iconView.layer.masksToBounds = YES;
  
      // 头像下移
      self.iconView.transform = CGAffineTransformMakeTranslation(0, 50);
  
      dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
  
          [UIView animateWithDuration:1.0 animations:^{
  
              // 文字图片慢慢消失
              self.sloganView.alpha = 0;
  
          } completion:^(BOOL finished) {
  
              // 显示头像
              self.iconView.hidden = NO;
  
              [UIView animateWithDuration:1.0 delay:0 usingSpringWithDamping:0.3
              initialSpringVelocity:0
              options:UIViewAnimationOptionCurveLinear
              animations:^{
                  // 头像往上移动的动画，弹簧效果
                  self.iconView.transform = CGAffineTransformIdentity;
  
              } completion:^(BOOL finished) {
  
                  self.textView.alpha = 0;
                  self.textView.hidden = NO;
  
                  // 文字慢慢显示
  
                  [UIView animateWithDuration:0.5 animations:^{
  
                      // 欢迎回来 的文字慢慢显示
                      self.textView.alpha = 1;
  
                  } completion:^(BOOL finished) {
  
                      dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)),
                      dispatch_get_main_queue(), ^{
  
                          // 移除
                          [self removeFromSuperview];
                      });
                  }];
              }];
          }];
      });
  }
  
  @end

• 1.3 AppDelegate.m

  #import "CHWelcomeView.h"
  
  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  
      // 创建窗口
      self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
      UIStoryboard *stroyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
      UIViewController *vc = [stroyboard instantiateInitialViewController];
      self.window.rootViewController = vc;
      [self.window makeKeyAndVisible];
  
      // 显示欢迎界面
      CHWelcomeView *welcomeV = [CHWelcomeView weicomeView];
      welcomeV.frame = self.window.bounds;                // 注意：一定要给界面设置 Frame
      [self.window addSubview:welcomeV];
  
      return YES;
  }

• 1.4 效果

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