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;}