登陸的時候有用戶名跟密碼,只有兩者全部輸入時登陸按鈕纔會變亮才能點擊登陸,否則爲灰,不能登陸。這時候就用到了監聽
-(void)viewDidLoad
{
//監聽文本輸入框的變化
//1.拿到通知中心
NSNotificationCenter * center = [NSNotificationCenter defaultCenter];
//2.註冊監聽 注意點:一定要寫上通知的發佈者 accountField
[center addObserver:self selector:@selector(textChange) name:UITextFIeldTextDidChangeNotification Object:seif.accountField];
[senter addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification Object:self.pwdField];
}
-(void) textChange
{
//1.判斷是否同時輸入了賬號和密碼
if (self.accountField.text.length && self.pwdField.text.length )
{
//2.讓登陸按鈕可用
self.loginBtn.enabled = YES;
}
else
{
self.loginBtn.enabled = NO;
}
//等同於上面的代碼
self.loginBtn.enabled = (self.accountField.text.length > 0 &&self.pwdField.text.length > 0);
}
-(IBAction)remPwdchange:(id)sender
{
//1.判斷是否記住密碼
if (self.remPwdSwitch.isOn == NO)
{
//2.如果取消記住密碼取消自動登錄
[self.autoLoginSwitch setOn:ON animated:YES];
}
}
-(IBAction)autoLoginchange:(id)sender
{
//1.判斷是否自動登錄
if(self.autoLoginSwitch.isOn)
{
//2.如果自動登錄就記住密碼
[self.remPwdSwitch setOn:YES animated:YES];
}
}
跳轉分爲手動執行segue和自動跳轉
-(IBAction)loginOnclick:(UIButton *)sender
{
//添加蒙版禁止用戶操作,並且提示用戶正在登陸 這裏用到了第三方類庫,已經封裝好的下載直接拖進工程,加上頭文件
[MBProgressHUD showMessage:@"正在拼命加載......"];
//登錄時需要一段時間連接服務器判斷,這裏用時間代替
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t) (1.5 * NSEC_PER_SEC)),dispatch_get_main_queue(), ^{
//1.判斷賬號是否正確
if (![self.accountField.text isEqualToString:@"su"]){
//登陸成功後移除蒙版
[MBProgressHUD hideHUD];
[MBProgressHUD showErroe:@"用戶名不正確!"];
return;
}
if (![self.pwdField.text isEqualToString:@"123"]){
//登陸成功後移除蒙版
[MBProgressHUD hideHUD];
[MBProgressHUD showError:@"密碼不正確!"];
return;
}
//登陸成功後移除蒙版
[MBProgressHUD hideHUD];
//如果正確,跳轉到聯繫人界面(手動執行segue) login2contatcs是在視圖segue添加的身份
[self performSegueWithIdentifier:@"login2contatcs" sender:nil];
});
}
//在segue跳轉之前,會傳入performSegueWithIdentifier方法創建好的segue對象
-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
//1.拿到目標控制器
UIViewController * vc = segue.destinationViewController;
//2.設置目標控制器
//vc.navitionItem.title = [NSString stringWithFormat:@"%@ 的聯繫人列表",self.accountField.text];
//vc.title = vc.navigationItem.title;
vc.title = [NSString stringWitnFormat;@"%@ 的聯繫人列表",self.accountField.text];
}
-(void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}