Select a date range and determine whether the selected start date and end date are correct.

Select a date range and determine whether the selected start date and end date are correct.

// Convert the string into a date for the next comparison

-(Nsdate *) stringtodate: (nsstring *) String

{

Nsdateformatter * dateformatter = [[nsdateformatter alloc] init];

[Dateformatter setdateformat: @ "yyyy-mm-dd"];

Nsdate * Date = [dateformatter datefromstring: String];

// Nslog (@ "date % @", date );

[Dateformatter release];

Return date;

}

// ++ ++ //

// Click the search button.

-(Void) searchmessage

{

// ======================== Hide the time selector that is not hidden first ====================== ======== //

[Uiview beginanimations: Nil context: Nil];

[Uiview setanimationduration: 0.3];

// Hide the toolbar

Cgrect toolbarframe = self. navigationcontroller. toolbar. frame;

Toolbarframe. Origin. Y =

Self. View. bounds. Size. height + 65;

Self. navigationcontroller. toolbar. Frame = toolbarframe;

// Hide the finish button

Uibarbuttonitem * spacebutton = [[uibarbuttonitem alloc]

Initwithbarbuttonsystemitem: uibarbuttonsystemitemfixedspace

Target: Nil action: Nil] autorelease];

[Self settoolbaritems: [nsarray arraywithobject: spacebutton] animated: Yes];

// Hide the date Selector

Datepicker _. Frame = toolbarframe;

[Uiview commitanimations];

// ================================================ ==================================== //

If ([begindatetextfield _. Text length] & [enddatetextfield _. Text length])

{

*************************//

Nsdate * begindate = [self stringtodate: begindatetextfield _. Text];

Nsdate * enddate = [self stringtodate: enddatetextfield _. Text];

// If the start date is earlier than the end date, the next step is executed. Otherwise, a warning box is displayed.

If (nsorderedascending = [begindate compare: enddate])

{

// Execute the next step

............

}

Else // Date range error

{

Uialertview * erroralert = [[uialertview alloc] initwithtitle: @ "incorrect date range" message: @ "Please select the correct date range" delegate: Self cancelbuttontitle: @ "OK" otherbuttontitles: nil, nil];

[Erroralert show];

[Erroralert release];

}

//************************************** *****//

}

Else // Date range not selected, with an unselected date

{

Uialertview * erroralert = [[uialertview alloc] initwithtitle: @ "Date range not selected" message: @ "select date range" delegate: Self cancelbuttontitle: @ "OK" otherbuttontitles: nil, nil];

[Erroralert show];

[Erroralert release];

}

}