如何自定义UIPickerView的高度? [英] How to customise UIPickerView height?

问题描述

如何自定义UIPickerView的高度?我希望它高到250以上.

How can I customise the height of a UIPickerView? I would like it to be taller more than 250.

我已经完成以下操作，但无法设置给定的高度.

I have done the following but I'm unable to set the given height.

-(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];
}

推荐答案

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

Here there are only three valid heights for UIPickerView (162.0, 180.0 and 216.0).

您可以使用 CGAffineTransformMakeTranslation 和 CGAffineTransformMakeScale 函数来使选择器正确使用，以方便您使用.

You can use the CGAffineTransformMakeTranslation and CGAffineTransformMakeScale functions to properly fit the picker to your convenience.

示例:

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) );

上面的代码将选取器视图的高度更改为一半，然后将其重新放置到确切的位置(左x1，上y1).

The above code change the height of picker view to half and re-position it to the exact (Left-x1, Top-y1) position.

在此处参考更多.如何更改UIPickerView高度

这篇关于如何自定义UIPickerView的高度?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！