Uiactionsheet operation form-iOS development

What is an operation form? Figure:

You can see from the figure.

UIActionSheet* mySheet = [[UIActionSheet alloc]                           initWithTitle:@"ActionChoose"                            delegate:self                            cancelButtonTitle:@"Cancel"                           destructiveButtonTitle:@"Destroy"                           otherButtonTitles:@"OK", nil];    [mySheet showInView:self.view];

Similar to uialertview, we also process the actions after the button is pressed in the delegate method. Remember to add uiactionsheetdelegate to the delegate class.

- (void)actionSheetCancel:(UIActionSheet *)actionSheet{    //}- (void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{    //}-(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex{    //}-(void)actionSheet:(UIActionSheet *)actionSheet willDismissWithButtonIndex:(NSInteger)buttonIndex{    //}

Did you see the red button? It is a so-called destroy button supported by actionsheet, which plays a warning role on an action of a user,

For example, permanently delete a message or log. If you specify a destroy button, it will be highlighted in red:

mySheet.destructiveButtonIndex=1;

Similar to the navigation bar, the operation form also supports three styles:

Uiactionsheetstyledefault // default style: The white text uiactionsheetstyleblacktranslucent is displayed on the gray background // The transparent black background, the white text uiactionsheetstyleblackopaque // The pure black background, and the white text

Usage example:

Mysheet. actionsheetstyle = uiactionsheetstyleblackopaque;

There are three methods to display actionsheet:

1. display in a view. You can use showinview

[Mysheet showinview: Self];

2. To align actonsheet with the toolbar or label bar, you can use showfromtoolbar or showfromtabbar.

[Mysheet showfromtoolbar: toolbar];

[Mysheet showfromtabbar: tabbar];
Release Operation form

After you press the button, the actionsheet will disappear-unless the application has a special reason, You need to press a button. The dismiss method can be used to make the form disappear:

[mySheet dismissWithClickButtonIndex:1 animated:YES];