uipickerview height problem

uipickerview can use setframe set the size, but I set a height of 80 or less, you can not change, and this is why ah Seek expert answers
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UIPickerView height seems to be fixed
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quote 1 floor darkdong reply:

UIPickerView height seems to be fixed

Edit properties of the control bar can not be set, but setframe can be changed, that is, the following will not change to 80, more than 100 can be