3D立体相册，一个可旋转的立体相册

   // 调用展示
self.sphereView = [[YoungSphere alloc] initWithFrame:CGRectMake(20, 200, 340, 320)];
NSMutableArray *array = [[NSMutableArray alloc] initWithCapacity:0];
for (NSInteger i = 0; i < 30; i ++) {
    self.btn = [UIButton buttonWithType:UIButtonTypeSystem];
    [_btn setBackgroundImage:[UIImage imageNamed:@"dog"] forState:(UIControlStateNormal)];
    _btn.frame = CGRectMake(0, 0, 60, 60);
    [_btn addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
    [array addObject:_btn];
    [_sphereView addSubview:_btn];
}
[_sphereView setCloudTags:array];
_sphereView.backgroundColor = [UIColor whiteColor];

[self.view addSubview:_sphereView];