ios - 我怎样才能像 Play Music 应用程序一样弹出消息

Question

我想在他们的应用程序中添加像谷歌播放音乐应用程序这样的栏。我想使用与他们正在做的相同的动画效果。因此，任何人都可以指导我是否有任何开源代码可以在应用程序中添加此功能，或者我需要手动编写所有代码，任何指南都会有所帮助，我在网上搜索但没有找到。

Answer 1

@interface ViewController ()
@property (nonatomic, weak) UILabel *popupLabel;
@end

@implementation ViewController

- (UILabel *)popupLabel
{
    if( !_popupLabel ) {
        CGFloat height = 44.0;
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0,
                                                                   self.view.bounds.size.height - height,
                                                                   self.view.bounds.size.width,
                                                                   height)];
        label.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.5];
        label.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
        label.textAlignment = NSTextAlignmentCenter;
        label.textColor = [UIColor whiteColor];
        label.alpha = 0.0;
        [self.view addSubview:label];

        _popupLabel = label;
    }
    [self.view bringSubviewToFront:_popupLabel];
    return _popupLabel;
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    [self performSelector:@selector(showWithMessage:) withObject:@"1 song added to playlist" afterDelay:2.0];

}

- (void)showWithMessage:(NSString *)message
{
    self.popupLabel.text = message;
    [UIView animateWithDuration:1.0 animations:^{
        self.popupLabel.alpha = 1.0;
    }];
}

- (void)hide
{
    [UIView animateWithDuration:1.0 animations:^{
        self.popupLabel.alpha = 0.0;
    }];
}