textfield有個屬性leftview,設定一個只有寬度的leftView.然後需要將leftViewMode設定為UITextFieldViewModeAlways.因為預設textfield.leftView是不顯示的.

 

//設定文字框左邊的view
   UITextField *textField = [[UITextField alloc]init];
   textField.frame = CGRectMake(50, 50, 300, 30);
   [self.view addSubview:textField];
   textField.leftView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 6, 0)];
   //設定顯示模式為永遠顯示(預設不顯示)
   textField.leftViewMode = UITextFieldViewModeAlways;