2016-1-5 the first full app private address Book Implementation 2: Add Prompt user's prompt box, listen to text box

One: Pop-up Prompt user's prompt box when login:

1. Use a third-party framework.

2. Add the following code to the login button click event:

-(Ibaction) loginbtnclicked {    NSString *acount = self.acountField.text;    NSString *password = self.passwordfield.text;//    jump out of the login prompt    [mbprogresshud showmessage:@ "Landing"];//    Analog loading Qaq Feel good    dispatch_after (Dispatch_time (Dispatch_time_now, (int64_t) (2.0 * nsec_per_sec)), dispatch_get_ Main_queue (), ^{//        Hide the login prompt box        [mbprogresshud hidehud];//        determine if the user account password is entered correctly, jump out of the prompt and jump to the interface        if ([acount isequaltostring:@ "Zhangsan"]&&[password isequaltostring:@ "123"]) {            [self performseguewithidentifier: @ "Contactsviewcontroller" sender:nil];            [Mbprogresshud showsuccess:@ "landing Success"];        } else{            [mbprogresshud showerror:@ "account password Error"];}}    );

3. In-(void) Prepareforsegue: (Uistoryboardsegue *) Segue Sender: (ID) The sender method gives the target controller special recursion parameters

The code is as follows

-(void) Prepareforsegue: (Uistoryboardsegue *) Segue Sender: (ID) sender{#warning get the Segue target controller first, but set a new CONTACTVC, Why do the properties of the Segue target controller also change?    id destcontroller = Segue.destinationviewcontroller;    if ([Destcontroller Iskindofclass:[contacttableviewcontroller class]]) {        Contacttableviewcontroller *contactVc = Destcontroller;        Contactvc.name = Self.acountField.text;    }}

This code has a do not understand the place, oneself dozen #waring, temporarily do not think, later to solve it ~

4. The actual effect is as follows:

Two: Listening text login box

1. Using notification hubs, the code is as follows:

-(void) viewdidload {    [super viewdidload];    self.loginBtn.enabled = no;//    Notification Center listens for text changes,//    set up notification hubs, set Viewer subscription notifications    [[Nsnotificationcenter Defaultcenter] Addobserver:self selector: @selector (textchange) name:uitextfieldtextdidchangenotification Object:self.acountField ];    [[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (textchange) Name: Uitextfieldtextdidchangenotification Object:self.passwordField];    }

What the controller does when it receives notification of a change in text-(void) textchange{//the    login button is available only if the account and password have a length in the text login box    self.loginBtn.enabled = (self.acountField.text.length >= 5 && self.passwordField.text.length >= 3);}

Actual effect:

2. You can also add an event directly to TextField, with the following code:

    [Self.acountfield addtarget:self Action: @selector (TextChange) forcontrolevents:uicontroleventeditingchanged];    [Self.passwordfield addtarget:self Action: @selector (TextChange) forcontrolevents:uicontroleventeditingchanged];

You can also connect directly in the Mainstroyboard:

2016-1-5 the first full app private address Book Implementation 2: Add Prompt user's prompt box, listen to text box