iOS UITextField 响应键盘的return 事件

UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 100, 30)] textField.returnKeyType = UIReturnKeySearch; //设置按键类型 textField.enablesReturnKeyAutomatically = YES; //这里设置为无文字就灰色不可点

在代理方法中响应

- (BOOL)textFieldShouldReturn:(UITextField *)textField {     [self searchAction];     [textField resignFirstResponder];     return YES; }

原文：https://www.cnblogs.com/jukaiit/p/9255030.html