UIPicker首先出现黑色

我有以下代码来绘制自定义选取器。不幸的是，当第一次绘制视图是黑色的。只有当我触摸它时才会出现。UIPicker首先出现黑色

我该如何解决这个问题？

这里是UIView的相关代码：

- (void)drawRect:(CGRect)rect 
{ 
    [self createPicker]; 
    [self addSubview:dPicker]; 
//[dPicker reloadComponent:1]; 
} 

-(void) createPicker 
{ 
    dPicker = [[UIPickerView alloc] initWithFrame:CGRectZero]; 
    CGSize pickerSize = [dPicker sizeThatFits:CGSizeZero]; 
    dPicker.frame = [self pickerFrameWithSize:pickerSize]; 
    dPicker.delegate=self; 
    dPicker.showsSelectionIndicator = YES; 
    dPicker.hidden=NO; 
} 


- (CGRect)pickerFrameWithSize:(CGSize)size 
{ 
    CGRect screenRect = [[UIScreen mainScreen] applicationFrame]; 
    CGRect pickerRect = CGRectMake(0.0, 
           screenRect.size.height - 44.0 - size.height, 
           size.width, 
           size.height); 
    return pickerRect; 
}

来源

2010-09-04 John Smith

固定它。从UIViewController调用子视图而不是UIView

来源

2010-09-07 15:49:08

UIPicker首先出现黑色

回答

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