核心动画的使用

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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