設定UITextfield 的 keyboard type 或是inputview 沒有反應的時候

平常看到要設定鍵盤的型別, 如下
typedef enum : NSInteger { UIKeyboardTypeDefault, UIKeyboardTypeASCIICapable, UIKeyboardTypeNumbersAndPunctuation, UIKeyboardTypeURL, UIKeyboardTypeNumberPad, UIKeyboardTypePhonePad, UIKeyboardTypeNamePhonePad, UIKeyboardTypeEmailAddress, UIKeyboardTypeDecimalPad, UIKeyboardTypeTwitter, UIKeyboardTypeWebSearch, UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable } UIKeyboardType;

就是使用textField.keyboardType = UIKeyboardTypeNamePhonePad;
或是要把鍵盤改成選擇日期的UIDatePicker,
則是使用 textField.inputView = self.customInput;(自己宣告的UIDatePicker)

若是沒有反應, 要記得兩點：
1. reload

textField.keyboardType = UIKeyboardTypeEmailAddress;
[textField reloadInputViews];

2. 必須在這個textfield被喚起時reload才有用

例如要先執行

[textField becomeFirstResponder]; 

或是在這個textfield的delegate被喚起的時候

 - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField

再來進行步驟1