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• (void)setUpLaunchScreen{

  NSURL *fileUrl;
  if (screen_width==480) {// 屏幕的高度为480
  fileUrl = [[NSBundle mainBundle] URLForResource:@"startup1" withExtension:@"gif"]; // 加载GIF图片
  }else if(screen_width==568) {// 屏幕的高度为568
  //5 5s 0.853333 0.851574
  fileUrl = [[NSBundle mainBundle] URLForResource:@"startup2" withExtension:@"gif"]; // 加载GIF图片

  }else if(screen_width==667){// 屏幕的高度为667
  //6 6s 7 1.000000 1.000000
  fileUrl = [[NSBundle mainBundle] URLForResource:@"startup3" withExtension:@"gif"]; // 加载GIF图片
  }else if(screen_width==736){// 屏幕的高度为736
  //6p 6sp 7p
  fileUrl = [[NSBundle mainBundle] URLForResource:@"startup4" withExtension:@"gif"]; // 加载GIF图片
  }else if(screen_width==812){// 屏幕的高度为812 375.000000 812.000000
  // x
  fileUrl = [[NSBundle mainBundle] URLForResource:@"startup5" withExtension:@"gif"]; // 加载GIF图片
  }else{

  }

  CGImageSourceRef gifSource = CGImageSourceCreateWithURL((CFURLRef) fileUrl, NULL); //将GIF图片转换成对应的图片源
  size_t frameCout = CGImageSourceGetCount(gifSource); // 获取其中图片源个数，即由多少帧图片组成
  NSMutableArray *frames = [[NSMutableArray alloc] init]; // 定义数组存储拆分出来的图片
  for (size_t i = 0; i < frameCout; i++) {
  CGImageRef imageRef = CGImageSourceCreateImageAtIndex(gifSource, i, NULL); // 从GIF图片中取出源图片
  UIImage *imageName = [UIImage imageWithCGImage:imageRef]; // 将图片源转换成UIimageView能使用的图片源
  [frames addObject:imageName]; // 将图片加入数组中
  CGImageRelease(imageRef);
  }

  self.launchImageView = [[UIImageView alloc]initWithFrame:self.window.bounds];
  NSLog(@"宽高为%lf %lf",self.window.bounds.size.width,self.window.bounds.size.height);
  self.launchImageView.userInteractionEnabled = YES;

  self.launchImageView.animationImages = frames; // 将图片数组加入UIImageView动画数组中
  self.launchImageView.animationDuration = 0.7; // 每次动画时长
  [self.launchImageView startAnimating]; // 开启动画，此处没有调用播放次数接口，UIImageView默认播放次数为无限次，故这里不做处理

  [[UIApplication sharedApplication].keyWindow addSubview:self.launchImageView];
  [[UIApplication sharedApplication].keyWindow bringSubviewToFront:self.launchImageView];

  //5秒后自动关闭
  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5*NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
  [self yourButtonClick];
  });

}

• (void)yourButtonClick {

  // 移动自定义启动图
  if (self.launchImageView) {
  [UIView animateWithDuration:0.3 animations:^{
  self.launchImageView.alpha = 0;
  } completion:^(BOOL finished) {
  [self.launchImageView removeFromSuperview];
  self.launchImageView = nil;
  }];
  }
  }