更改UIPickerView选中框颜色


        [pickerView.subviews objectAtIndex:1].layer.borderWidth = 0.5f;

        [pickerView.subviews objectAtIndex:2].layer.borderWidth = 0.5f;

        [pickerView.subviews objectAtIndex:1].layer.borderColor = [UIColor redColor].CGColor;

        [pickerView.subviews objectAtIndex:2].layer.borderColor = [UIColor redColor].CGColor;

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