摇动手势可在模拟器上使用，但不适用于iPhone

Question

我的应用程序中有一些代码可用来检测抖动，一旦设备抖动，背景图片就会发生变化，屏幕上的某些元素被隐藏，而另一些则未被隐藏。 如果再次摇动它，它会返回到原始显示...这在模拟器上可以完美运行，但在我的实际iPhone 5S上却根本不起作用！

如果摇动iPhone，我会看到更改闪烁，但是不到一秒钟便返回到原始视图。 这是我的代码：

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
if (motion == UIEventSubtypeMotionShake)
{
    UIImage *iPhone5backgroundDO = [UIImage imageNamed:@"image1.png"];
    UIImage *iPhone4backgroundDO = [UIImage imageNamed:@"image2.png"];
    UIImage *iPhone5background = [UIImage imageNamed:@"image3.png"];
    UIImage *iPhone4background = [UIImage imageNamed:@"image4.png"];

    if (_backgroundImage.image == iPhone5background) {
        [UIView animateWithDuration:0.5 animations:^(void) {
            self.backgroundImage.image = iPhone5backgroundDO;
            _yearsOut.alpha = 0.0;
            _yearsLabel.alpha = 0.0;
            _monthsOut.alpha = 0.0;
            _monthsLabel.alpha = 0.0;
            _daysOut.alpha = 0.0;
            _hoursOut.alpha = 0.0;
            _minsOut.alpha = 0.0;
            _secsOut.alpha = 0.0;
            _daysOnlyOut.alpha = 1.0;
            _daysLabel.frame = CGRectMake(139, 273, 42, 21);
            _hoursOutDO.alpha = 1.0;
            _hoursLabel.frame = CGRectMake(41, 374, 52, 21);
            _minsOutDO.alpha = 1.0;
            _minsLabel.frame = CGRectMake(126, 374, 66, 21);
            _secsOutDO.alpha = 1.0;
            _secsLabel.frame = CGRectMake(212, 374, 71, 21);
        }];
    } if (_backgroundImage.image == iPhone5backgroundDO) {
        [UIView animateWithDuration:0.5 animations:^(void) {
            self.backgroundImage.image = iPhone5background;
            _yearsOut.alpha = 1.0;
            _yearsLabel.alpha = 1.0;
            _monthsOut.alpha = 1.0;
            _monthsLabel.alpha = 1.0;
            _daysOut.alpha = 1.0;
            _hoursOut.alpha = 1.0;
            _minsOut.alpha = 1.0;
            _secsOut.alpha = 1.0;
            _daysOnlyOut.alpha = 0.0;
            _daysLabel.frame = CGRectMake(226, 331, 42, 21);
            _hoursOutDO.alpha = 0.0;
            _hoursLabel.frame = CGRectMake(45, 457, 52, 21);
            _minsOutDO.alpha = 0.0;
            _minsLabel.frame = CGRectMake(125, 457, 66, 21);
            _secsOutDO.alpha = 0.0;
            _secsLabel.frame = CGRectMake(210, 457, 71, 21);
        }];
    } if (_backgroundImage.image == iPhone4background) {
        [UIView animateWithDuration:0.5 animations:^(void) {
            self.backgroundImage.image = iPhone4backgroundDO;
            _yearsOut.alpha = 0.0;
            _yearsLabel.alpha = 0.0;
            _monthsOut.alpha = 0.0;
            _monthsLabel.alpha = 0.0;
            _daysOut.alpha = 0.0;
            _hoursOut.alpha = 0.0;
            _minsOut.alpha = 0.0;
            _secsOut.alpha = 0.0;
            _daysOnlyOut.alpha = 1.0;
            _daysLabel.frame = CGRectMake(139, 273, 42, 21);
            _hoursOutDO.alpha = 1.0;
            _hoursLabel.frame = CGRectMake(43, 374, 52, 21);
            _minsOutDO.alpha = 1.0;
            _minsLabel.frame = CGRectMake(127, 374, 66, 21);
            _secsOutDO.alpha = 1.0;
            _secsLabel.frame = CGRectMake(213, 374, 71, 21);
        }];
    } else if (_backgroundImage.image == iPhone4backgroundDO) {
        [UIView animateWithDuration:0.5 animations:^(void) {
            self.backgroundImage.image = iPhone4background;
            _yearsOut.alpha = 1.0;
            _yearsLabel.alpha = 1.0;
            _monthsOut.alpha = 1.0;
            _monthsLabel.alpha = 1.0;
            _daysOut.alpha = 1.0;
            _hoursOut.alpha = 1.0;
            _minsOut.alpha = 1.0;
            _secsOut.alpha = 1.0;
            _daysOnlyOut.alpha = 0.0;
            _daysLabel.frame = CGRectMake(212, 271, 45, 21);
            _hoursOutDO.alpha = 0.0;
            _hoursLabel.frame = CGRectMake(57, 371, 49, 21);
            _minsOutDO.alpha = 0.0;
            _minsLabel.frame = CGRectMake(122, 371, 66, 21);
            _secsOutDO.alpha = 0.0;
            _secsLabel.frame = CGRectMake(198, 371, 71, 21);
        }];
    }
}
} 

这是我的代码有问题吗？ 还是我只是试图做一些不可能的事情？

Answer 1

好的-在每次摇动和检测时，我都在其中扔了几个NSLogs，解决了问题是当第一个if语句为true时第二个if语句为true时，然后立即运行！ 所以我将if改为else if的排序方式-模拟器正在运行，因为我使用的是3.5“ sim卡，它已经具有else-if语句。