让UIPickerView纵穿来显示

让UIPickerView横过来显示

CGAffineTransform rotate = CGAffineTransformMakeRotation(-1.57);  
rotate = CGAffineTransformScale(rotate, 0.5, 1.0);
CGAffineTransform r = CGAffineTransformMakeTranslation(0, 0);
customPickerView.transform = CGAffineTransformConcat(rotate, r);

 

效果图：