如何自定义UIPickerView中文本的大小和文本靠左或靠右显示？

需要重写UIPickerView中的

 -(UIView*)pickerView:(UIPickerView*)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view 

方法

示例代码如下

//自定义uipickerview中的文字大小
-(UIView*)pickerView:(UIPickerView*)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    UILabel *myView=nil;
    
    myView=[[UILabel alloc]initWithFrame:CGRectMake(0.0, 0.0, 264, 30)];
    myView.textAlignment=NSTextAlignmentRight;
    
    if (pickerView==self.SourcePicker) {
        myView.text=[_SourcePickerArray objectAtIndex:row];
        
    }else{
        myView.text=[_RoomPickerArray objectAtIndex:row];
    }
    myView.font=[UIFont systemFontOfSize:17];
    myView.textColor=[UIColor blackColor];
    myView.backgroundColor=[UIColor clearColor];
    return  myView;
    
}

另外注意，ios6之前调整文本靠左或者靠右对齐的代码为

 mylabel.textAlignment= UITextAlignmentCenter; 

在ios7以上版本需要改为

 mylabel.textAlignment=NSTextAlignmentCenter;