如何自定义UIPickerView高度

Question

如何自定义UIPickerView的高度超过250.我做了以下但无法达到给定的高度

 -(void)pickerview:(id)sender
    {
        pickerView=[[UIPickerView alloc] initWithFrame:CGRectMake(0,200,320,400)];
        pickerView.transform = CGAffineTransformMakeScale(0.75f, 0.75f);
        pickerView.delegate = self;
        pickerView.dataSource = self;
        pickerView.showsSelectionIndicator = YES;
        pickerView.backgroundColor = [UIColor lightGrayColor];
        [pickerView selectRow:1 inComponent:0 animated:YES];
       [self.view addSubview:pickerView];
       // [contentView addSubview:pickerView];

    }

Answer 1

这里UIPickerView只有三个有效高度(162.0,180.0和216.0).

您可以使用CGAffineTransformMakeTranslation和CGAffineTransformMakeScale函数来正确地使拾取器适合您的方便.

例:

CGAffineTransform t0 = CGAffineTransformMakeTranslation( 0,
    pickerview.bounds.size.height/2 );
CGAffineTransform s0 = CGAffineTransformMakeScale(1.0, 0.5);
CGAffineTransform t1 = CGAffineTransformMakeTranslation( 0,
    pickerview.bounds.size.height/-2 );
pickerview.transform = CGAffineTransformConcat( t0,
    CGAffineTransformConcat(s0, t1) );

上面的代码将拾取器视图的高度更改为一半,并将其重新定位到精确(Left-x1,Top-y1)位置.

请参阅此处. 如何更改UIPickerView高度