Ios:uialertcontroller and Uialertaction's explanation

Cue box controller: Uialertcontroller

Prompt Box button: uialertaction  function: used to prompt the information, and give some can choose the button to handle the corresponding requirements.  Note:In Xcode's IOS8 SDK, Uialertview and Uiactionsheet are replaced by Uialertcontroller. The official library explains: "Uialertview is deprecated. Use Uialertcontroller with a preferredstyle of Uialertcontrollerstylealert instead. "," Uiactionsheet is deprecated. Use Uialertcontroller with a preferredstyle of Uialertcontrollerstyleactionsheet instead. ". Illustrates the development of ios8+, Uialertview and Uiactionsheet are obsolete, uialertcontroller in a modular replacement to replace these two control functions and roles. How to create and use Uialertcontroller becomes our concern.  class Description: 1, Cue box style enumeration (divided into Uialertview, uiactionsheet)

typedef ns_enum (Nsinteger, Uialertcontrollerstyle) {

Uialertcontrollerstyleactionsheet = 0, //Cue box pops up at the bottom of the view

Uialertcontrollerstylealert //Popup box in the middle of the view

} ns_enum_available_ios (8_0);

2 . The style of the button on the Cue box

typedef ns_enum (Nsinteger, Uialertactionstyle) {

Uialertactionstyledefault = 0, //Default Confirmation button

Uialertactionstylecancel, //default Cancel button

Uialertactionstyledestructive //Default red button

}ns_enum_available_ios (8_0);

3. uialertcontroller: Cue box controller class

@interface Uialertcontroller:uiviewcontroller

Method:

To create a class method for a cue box controller

+ (Instancetype) Alertcontrollerwithtitle: (NSString *) title message: (NSString *) message Preferredstyle: ( Uialertcontrollerstyle) Preferredstyle;

Add an instance method of the text box on the prompt (only in the Uialertview style hint box)

-(void) Addtextfieldwithconfigurationhandler: (void (^) (Uitextfield *textfield)) Configurationhandler;

Add a button to the prompt box

-(void) Addaction: (uialertaction *) action;

Property:

An array of all the buttons on the Cue box

@property (nonatomic, readonly) Nsarray *actions;

An array of all text boxes on the prompt box

@property (nonatomic, readonly) Nsarray *textfields;

Title of the Cue box

@property (nonatomic, copy) NSString *title;

Prompt information

@property (nonatomic, copy) NSString *message;

Style of the Cue box controller

@property (nonatomic, readonly) Uialertcontrollerstyle Preferredstyle;

@end

4. Uialertaction: Prompt button

@interface Uialertaction:nsobject <NSCopying>

Method:

class method for creating a Cue box button

+ (Instancetype) Actionwithtitle: (NSString *) Title style: (Uialertactionstyle) style handler: (void (^) (uialertaction * Action)) handler;

Property:

Button title

@property (nonatomic, readonly) NSString *title;

The style of the button

@property (nonatomic, readonly) Uialertactionstyle style;

Whether the button is valid

@property (nonatomic, getter=isenabled) BOOL enabled;

@end

The specific examples are as follows:

To create a step:

1. Layout storyboard, drag a button in the view of the controller, and associate the Ibaction event

2. The main code in the associated event of the button is as follows:

Create a cue box controller

    // Create a cue box controller    Uialertcontroller *alertcontroller = [Uialertcontroller alertcontrollerwithtitle:@ " prompt box " Message:@ " messages "  Preferredstyle:uialertcontrollerstylealert];     = [Uicolor Purplecolor];

Create a prompt Box button

    // Create a prompt button    Uialertaction *action1 = [uialertaction actionwithtitle:@ " default Cancel"  style: Uialertactionstylecancel Handler:nil];         *action2 = [uialertaction actionwithtitle:@ ' default'  style: Uialertactionstyledefault Handler:nil];         *action3 = [uialertaction actionwithtitle:@ " default destructive" style: Uialertactionstyledestructive Handler:nil];

Add a hint button to the prompt box

    // Add a hint button     [Alertcontroller addaction:action1];    [Alertcontroller Addaction:action2];    [Alertcontroller Addaction:action3];

Add a text box to the Cue box (only for the cue box style: Uialertcontrollerstylealert)

    // Add a text box (only for Alertview type of cue box)    [Alertcontroller addtextfieldwithconfigurationhandler:^ (Uitextfield *textField) {        @ " account ";    }];    [Alertcontroller Addtextfieldwithconfigurationhandler:^ (Uitextfield *textField) {        @ "  password ";         // Safe Input mode    }];

Add a listen event to a text box

    // Add a listen event to a text box (start, End, state change, etc.)    [Alertcontroller addtextfieldwithconfigurationhandler:^ (Uitextfield *textField) {        @ "  Add Listener Event ";                [TextField addtarget:self Action: @selector (alerttextfileddidchanged:) forControlEvents: Uicontroleventeditingchanged];    }];

Display a cue box as a modal window

[Self Presentviewcontroller:alertcontroller animated:yes completion:nil];

Implementing a text Box event

#pragma mark text Box Listener event-(void) alerttextfileddidchanged: (nsnotification *) notification{    NSLog (@ "enditing changed");}

Click the button to display the results of the presentation

When the Action3 button is not added to the cue box, which is the number of buttons <=2, the style of the two prompts is:

Uialertcontrollerstylealert: Pop up from the middle of the screen

Uialertcontrollerstyleactionsheet: Pop-up from the bottom of the screen (cannot add a text box)

When the Action3 button is not added to the cue box, which is the number of buttons >=3, the style of the two prompts is:

Uialertcontrollerstylealert: Pop up from the middle of the screen

Uialertcontrollerstyleactionsheet: Pop-up from the bottom of the screen (cannot add a text box)

Ios:uialertcontroller and Uialertaction in a detailed