Question

我正在尝试为我的应用程序创建动画。我用我的按钮startButton开始动画。此按钮启动我的UIImage动画并更改其背景颜色。

我想重复这个动画，但我找不到这样做的方法。

- (IBAction)startButton:(id)sender {
    NSString * chosenColor = _colorField.text;
    NSString *color = [chosenColor substringToIndex:6];
    NSLog(@"colore: %@", color);
    NSString *color1 = [chosenColor substringFromIndex:8];
    NSLog(@"colore2: %@", color1);
    NSScanner* pScanner = [NSScanner scannerWithString: color];
    NSScanner * pScanner2 = [NSScanner scannerWithString:color1];
    unsigned int rgbValue = 0;
    unsigned int rgbValue2 = 0;
    [pScanner scanHexInt: &rgbValue];
    [pScanner2 scanHexInt:&rgbValue2];

    int index = 8;
    NSString *time = [NSString stringWithFormat:@"%c", [chosenColor characterAtIndex:index-2]];
    NSLog(@"tempo: %@", time);

    NSTimeInterval timeInterval = [time doubleValue];
    NSLog(@"interval: %f", timeInterval);

    _colorImage.backgroundColor = [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0
                                                  green:((float)((rgbValue & 0xFF00) >> 8))/255.0
                                                   blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0];

    [UIView animateWithDuration:timeInterval animations:^{
        _colorImage.backgroundColor = [UIColor colorWithRed:((float)((rgbValue2 & 0xFF0000) >> 16))/255.0
                                                      green:((float)((rgbValue2 & 0xFF00) >> 8))/255.0
                                                       blue:((float)(rgbValue2 & 0xFF))/255.0 alpha:1.0];
    } completion:NULL];
    }
}

Answer 1

使用像这样的NSTimer：

new Promise(…).then(…);

每当你想要动画结束时，只需调用[self.animationTimer invalidate]。 doAnimation：方法将NSTimer对象作为参数。

Answer 2

尝试添加此方法调用它。

-(void)runAnimationWithRepeateCount:(int)count
{
_colorImage.backgroundColor = [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0];

[UIView animateWithDuration:5 animations:^{
    _colorImage.backgroundColor = [UIColor colorWithRed:((float)((rgbValue2 & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue2 & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue2 & 0xFF))/255.0 alpha:1.0];
} completion:^(BOOL finished) {
    count = count-1;
    if (count>0) {            
        [self runAnimationWithRepeateCount:count];
    }
}];
}

并将计数传递给您想要运行动画的次数。

希望这会对你有所帮助。

Answer 3

使用UIViewAnimationOptionRepeat选项无限重复UIView动画。

+ (void)animateWithDuration:(NSTimeInterval)duration 
                      delay:(NSTimeInterval)delay 
                    options:(UIViewAnimationOptions)options 
                 animations:(void (^)(void))animations 
                 completion:(void (^)(BOOL finished))completion

image.backgroundColor更改并重复动画

3 个答案: