用动画更改子视图的颜色？

Question

我有一个 UISlider ，并在滑块的曲目中成功添加了一些子视图。我想用动画逐个逐个更改子视图的颜色。

Answer 1

此示例可能对您有所帮助，抱歉第一次没有完全理解您：

typedef void (^VoidBlock)(void);
@interface ClassName ()

@property (nonatomic, strong)VoidBlock animationBlock;

@end

- (void)runAnimation
{    
    NSArray *views = @[view1, view2, view3];

    __weak LibraryViewController *weak_self = self;
    __block NSInteger currentView = 0;  
    __block NSUInteger colorNumber = 0;
    self.animationBlock = ^{
        [UIView animateWithDuration:1 animations:^{
            if (colorNumber == 0){
                [views[currentView] setBackgroundColor:[UIColor colorWithRed:1 green:0 blue:0 alpha:1]];
            }
            else if (colorNumber == 1){
                [views[currentView] setBackgroundColor:[UIColor colorWithRed:0 green:1 blue:0 alpha:1]];
            }
            else {
                [views[currentView] setBackgroundColor:[UIColor colorWithRed:0 green:0 blue:1 alpha:1]];
            }

        } completion:^(BOOL finished) {
            currentView += 1;
            if (currentView == views.count){
                currentView = 0;                
                colorNumber += 1;
                if (colorNumber == views.count)
                    colorNumber = 0;
            }
            weak_self.animationBlock();
        }];
    };

    self.animationBlock();
}