Question

我正在以编程方式将两个自定义UIPickerView添加到另一个视图（MainView）。它们工作得很好但是在MainView的任何部分发生触摸事件之前它们都不可见。我已经检查了UIPickerView和UIView的类引用，但是没有找到任何设法“刷新”视图的东西，除非我遗漏了一些明显的东西？

这是我在MainView.m中的drawRect方法。我试过在viewDidLoad中做同样的事情，但没有成功。自定义旋转/变换等可以与它有关吗？

- (void)drawRect:(CGRect)rect { 
    CGRect pickerFrame = CGRectMake(50, -32, 30, 180);
    m_picker1 = [[UIPickerView alloc] initWithFrame:pickerFrame];
    m_picker1.delegate = self;  
    m_picker1.tag = k_ptag1;
    m_picker1.showsSelectionIndicator =YES;  
    m_picker1.backgroundColor = [UIColor clearColor]; 
    CGAffineTransform rotate = CGAffineTransformMakeRotation(3.14/2);  
    rotate = CGAffineTransformScale(rotate, 0.075, 0.85);  
    [m_picker1 setTransform:rotate];  
    [self addSubview:m_picker1]; 

    pickerFrame = CGRectMake(50, 67, 30, 180);
    m_picker2 = [[UIPickerView alloc] initWithFrame:pickerFrame];
    m_picker2.delegate = self;  
    m_picker2.tag = k_ptag2;
    m_picker2.showsSelectionIndicator =YES;  
    m_picker2.backgroundColor = [UIColor clearColor]; 
    rotate = CGAffineTransformMakeRotation(3.14/2);  
    rotate = CGAffineTransformScale(rotate, 0.075, 0.85);  
    [m_picker2 setTransform:rotate];  
    [self addSubview:m_picker2];
}

Answer 1

您可以在视图的控制器中添加子视图，而不是视图本身。我建议您熟悉MVC设计模式。

drawRect仅用于实际绘制视图本身，而不是用于子视图。

直到触摸发生UIPickerView才会出现

1 个答案: