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最近我遇到了一个UIViews通过IBOutlet. 在代码中实例化视图然后对其进行动画处理时，一切正常。但是，如果它是在情节提要中创建并通过IBOutlet没有动画进行分配的。有什么我想念的吗？

@property (nonatomic, strong) IBOutlet UIView *foreground;

我正在使用动画块

      [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{

        NSLog(@"oldForegroundFrame %@, newForeGroundFrame: %@", NSStringFromCGRect(self.foreground.frame), NSStringFromCGRect(foregroundFrame));

         self.foreground.frame = foregroundFrame;

        NSLog(@"oldForegroundFrame %@, newForeGroundFrame: %@", NSStringFromCGRect(self.foreground.frame), NSStringFromCGRect(foregroundFrame));            

    } completion:^(BOOL finished) {
        NSLog(@"oldForegroundFrame %@, newForeGroundFrame: %@", NSStringFromCGRect(self.foreground.frame), NSStringFromCGRect(foregroundFrame));  

    }];

NSLog 的打印输出显示在分配后框架设置正确，但在完成后它被重置为原始位置。

oldForegroundFrame {{0, 0}, {320, 133}}, newForeGroundFrame: {{0, -45}, {320, 45}} oldForegroundFrame {{0, -45}, {320, 45}}, newForeGroundFrame: { {0, -45}, {320, 45}} oldForegroundFrame {{0, 0}, {320, 133}}, newForeGroundFrame: {{0, -45}, {320, 45}}

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