uitabbaritem的alpha值

Question

我正在试图弄清楚如何将我的tabbaritem图标（图像）设置为0，这样一旦它加载到屏幕上我就可以给它一个淡入淡出的动画......但我只是不知道该怎么做..

这就是我将图像添加到标签栏的方式..

- (void)viewDidAppear:(BOOL)animated
{

    self.button0.image = [UIImage imageNamed:@"icon1.png"];
    self.button1.image = [UIImage imageNamed:@"icon2.png"];
    self.button2.image = [UIImage imageNamed:@"icon3.png"];
    self.button3.image = [UIImage imageNamed:@"icon4.png"];
    self.button4.image = [UIImage imageNamed:@"icon5.png"];
    self.button5.image = [UIImage imageNamed:@"icon1.png"];


}

我将使用看起来像这样的方法为它们设置动画

[UIView animateWithDuration:0.3f
                              delay:0.0f
                            options:UIViewAnimationOptionCurveEaseOut
                         animations:^{
                             // Do your animations here
                         }
                         completion:^(BOOL finished){
                             if (finished) {
                                 // Do your method here after your animation.

                             }
                         }];

任何帮助将不胜感激。

更新这是我最近的尝试还没有成功..

buttonImage0.image = [UIImage imageNamed:@"icon1.png"];
    buttonImage0.alpha = 0.0;
    self.button0.image = buttonImage0.image;


    [UIView animateWithDuration:0.1f
                          delay:0.0f
                        options:UIViewAnimationOptionTransitionNone
                     animations:^{
                         // Do your animations here.
                         buttonImage0.alpha = 1.0;
                     }
                     completion:^(BOOL finished){
                         if (finished) {
                             // Do your method here after your animation.
                         }
                     }];

Answer 1

UIButton是UIView的子类。 UIView有一个alpha属性。

尝试：

self.button0.alpha = 0.0;
self.button1.alpha = 0.0;
self.button2.alpha = 0.0;
self.button3.alpha = 0.0;
self.button4.alpha = 0.0;
self.button5.alpha = 0.0;

在你的viewDidAppear中

;

然后使用相同的alpha属性将你的缓动函数放在animateWithDuration例程中！