iOS开发- 启动动画(动态欢迎界面,非静态Default)【转

《青葱日记》这款App的启动界面做的很精美。
不同自己之前简单的替换Default.png图片。 它的动态效果做的不错。
其实也很简单，具体效果如下

实现起来也不困难。因为我们知道，在应用启动的时候,它会先执行AppDelegate.m中的

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

执行完之后,才会进入视图。如果，我们在这个方法中加入一些动画，那么就会在动画执行完之后再进入我们的rootview。这就是实现原理。 很简单吧。
下面直接给出实现这一效果的源码,很简单。不多说废话（当然,实现方法很多。 我只是给出我自己的方法）

1.AppDelegate.h中声明一个UIImageView

@property (strong, nonatomic) UIImageView *splashView;

2.AppDelegate.m实现相关功能

@synthesize splashView;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    [self.window makeKeyAndVisible];
     
    splashView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 320, 568)];
    [splashView setImage:[UIImage imageNamed:@"back_"]];
     
    [self.window addSubview:splashView];
    [self.window bringSubviewToFront:splashView];
     
     
    [self performSelector:@selector(scale_1) withObject:nil afterDelay:0.0f];
    [self performSelector:@selector(scale_2) withObject:nil afterDelay:0.5f];
    [self performSelector:@selector(scale_3) withObject:nil afterDelay:1.0f];
    [self performSelector:@selector(scale_4) withObject:nil afterDelay:1.5f];
    [self performSelector:@selector(scale_5) withObject:nil afterDelay:2.0f];
    [self performSelector:@selector(showWord) withObject:nil afterDelay:2.5f];
 
     
    return YES;
}
 
-(void)scale_1
{
    UIImageView *round_1 = [[UIImageView alloc]initWithFrame:CGRectMake(100, 240, 15, 15)];
    round_1.image = [UIImage imageNamed:@"round_"];
    [splashView addSubview:round_1];
    [self setAnimation:round_1];
}
 
-(void)scale_2
{
    UIImageView *round_2 = [[UIImageView alloc]initWithFrame:CGRectMake(105, 210, 20, 20)];
    round_2.image = [UIImage imageNamed:@"round_"];
    [splashView addSubview:round_2];
    [self setAnimation:round_2];
}
 
-(void)scale_3
{
    UIImageView *round_3 = [[UIImageView alloc]initWithFrame:CGRectMake(125, 170, 30, 30)];
    round_3.image = [UIImage imageNamed:@"round_"];
    [splashView addSubview:round_3];
    [self setAnimation:round_3];
}
 
-(void)scale_4
{
    UIImageView *round_4 = [[UIImageView alloc]initWithFrame:CGRectMake(160, 135, 40, 40)];
    round_4.image = [UIImage imageNamed:@"round_"];
    [splashView addSubview:round_4];
    [self setAnimation:round_4];
}
 
-(void)scale_5
{
    UIImageView *heart_1 = [[UIImageView alloc]initWithFrame:CGRectMake(130, 180, 100, 100)];
    heart_1.image = [UIImage imageNamed:@"heart_"];
    [splashView addSubview:heart_1];
    [self setAnimation:heart_1];
}
 
-(void)setAnimation:(UIImageView *)nowView
{
     
    [UIView animateWithDuration:0.6f delay:0.0f options:UIViewAnimationOptionCurveLinear
                     animations:^
                    {
                        // 执行的动画code
                        [nowView setFrame:CGRectMake(nowView.frame.origin.x- nowView.frame.size.width*0.1, nowView.frame.origin.y-nowView.frame.size.height*0.1, nowView.frame.size.width*1.2, nowView.frame.size.height*1.2)];
                     }
                     completion:^(BOOL finished)
                    {
                         // 完成后执行code
                        [nowView removeFromSuperview];
                     }
     ];
     
 
}
 
-(void)showWord
{
     
    UIImageView *word_ = [[UIImageView alloc]initWithFrame:CGRectMake(75, 440, 170, 29)];
    word_.image = [UIImage imageNamed:@"word_"];
    [splashView addSubview:word_];
     
    word_.alpha = 0.0;
    [UIView animateWithDuration:1.0f delay:0.0f options:UIViewAnimationOptionCurveLinear
                     animations:^
                     {
                         word_.alpha = 1.0;
                     }
                     completion:^(BOOL finished)
                     {
                         // 完成后执行code
                         [NSThread sleepForTimeInterval:1.0f];
                         [splashView removeFromSuperview];
                     }
     ];
}

[原文链接]：(http://www.2cto.com/kf/201402/277821.html)