textField.autocapitalizationType = .None
textField.autocapitalizationType = UITextAutocapitalizationTypeNone;
所有选项:
.None\ UITextAutocapitalizationTypeNone:不要自动大写
.Words\ UITextAutocapitalizationTypeWords:自动将每个单词大写
.Sentences\ UITextAutocapitalizationTypeSentences:自动将句子中的第一个单词大写
.AllCharacters\ UITextAutocapitalizationTypeAllCharacters:自动大写每个字母(即大写锁定)