关于UIPickerView改变尺寸

常规方法无法修改pickerView的尺寸；这时我们就需要改变它的layer.

UIPickerView *picker = [[UIPickerViewalloc] init];

picker.frame = CGRectMake(50,50,100,35);

piker.layer.frame =CGRectMake(50,50,100,35);

[self.view addSubview:picker];