Prasad Tandulwadkar
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Homepage: http://wwww.mobisoftinfotech.com
Posts by Prasad Tandulwadkar
iPhone Local Notifications
Nov 22nd
Local notifications :
Local notifications are used to notify user that application is having some updates,
while application is not running in foreground. We can display an alert message or badge on application icon. Local notifications can play sound when alert message or badge is shown.
We can use local notification to remind our daily or monthly tasks at particular time like water plants, pay electricity bill, attend seminar , prepare for presentation etc. In these cases we can use local notification.
Create notification :
- (void)scheduleNotification { [[UIApplication sharedApplication] cancelAllLocalNotifications]; UILocalNotification notif = [[cls alloc] init]; notif.fireDate = [datePicker date]; notif.timeZone = [NSTimeZone defaultTimeZone]; notif.alertBody = @"Reminder for you"; notif.alertAction = @"Show"; notif.soundName = UILocalNotificationDefaultSoundName; notif.applicationIconBadgeNumber = 1; NSDictionary *userDict = [NSDictionary dictionaryWithObject:@"Notification text" forKey:kRemindMeNotificationDataKey]; notif.userInfo = userDict; [[UIApplication sharedApplication] scheduleLocalNotification:notif]; [notif release];
}
Cancel any exiting local notification
[[UIApplication sharedApplication] cancelAllLocalNotifications];
Allocate and initialize UILocalNotification object
UILocalNotification *notif = [[cls alloc] init];
Set fire date and timezone. Fire date is date and time when system should deliver the notification. Date is calculated depending on timezone specified.If we do not specify timezone then it will take GMT as default time zone.
notif.fireDate = [datePicker date]; notif.timeZone = [NSTimeZone defaultTimeZone];
We can control alert message displayed when notification is delivered by setting alertBody and alert action by setting alertAction.
notif.alertBody = @"Reminder for you"; notif.alertAction = @"Show";
We can also specify sound to be played when notification is delivered by setting soundName and also specify badge number on application icon by setting applicationIconBadgeNumber.
notif.soundName = UILocalNotificationDefaultSoundName; notif.applicationIconBadgeNumber = 1;
We can also pass custom data with notification by adding it into dictionary. We can add dictionary to notification using userInfo property.
NSDictionary *userDict = [NSDictionary dictionaryWithObject:@"Notification text" forKey:kRemindMeNotificationDataKey]; notif.userInfo = userDict;
Here we are passing notification text as custom data.
In case if we want to increase icon badge number we can get current badge number by using.
[[UIApplication sharedApplication] applicationIconBadgeNumber ];
If you want to repeat notification then you can set following property to required calendar unit.
notif.repeatInterval = NSMinuteCalendarUnit; OR notif.repeatInterval = NSHourCalendarUnit; OR notif.repeatInterval = NSDayCalendarUnit; OR notif.repeatInterval = NSWeekCalendarUnit;
UITableView Tutorial : Introduction to iPhone TableView
Feb 11th
Table view is commonly used to show lists of data. A table view is the view object that displays table’s data and instance of UITableView. Each visible row in a table view is implemented by UITableViewCell. Table views are not responsible for storing your table’s data. They store only enough data to draw the rows that are currently visible. Table views get their configuration data from an object that conforms to the UITableViewDelegate protocol and their row data from an object that conforms to the UITableViewDataSource protocol.
Follow the steps below to create UITableView sample:
1.Open Xcode and create new view based project named ‘SimpleTable’
2.Modify code in the SimpleTableViewController.h file as follow:
#import <UIKit/UIKit.h>
@interface SimpleTableViewController : UIViewController
<UITableViewDelegate,UITableViewDataSource>{
NSArray *listData;
}
@property(nonatomic, retain) NSArray *listData;
@end
3.Open SimpleTableViewController.xib file and drag Table View from Library over to the View Window.
4.Connect tableview’s dataSource and delegate from connection inspector to File’s Owner.
5.Modify code in the SimpleTableViewController.m file as follow:
#import "SimpleTableViewController.h"
@implementation SimpleTableViewController
@synthesize listData;
- (void)viewDidLoad {
NSArray *array = [[NSArray alloc] initWithObjects:@"iPhone", @"iPod",
@"iPad",nil];
self.listData = array;
[array release];
[super viewDidLoad];
}
- (void)dealloc {
[listData dealloc];
[super dealloc];
}
#pragma mark -
#pragma mark Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section
{
return [self.listData count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *SimpleTableIdentifier = @"SimpleTableIdentifier";
UITableViewCell *cell = [tableView
dequeueReusableCellWithIdentifier:SimpleTableIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:SimpleTableIdentifier] autorelease];
}
NSUInteger row = [indexPath row];
cell.textLabel.text = [listData objectAtIndex:row];
return cell;
}
@end
In viewDidLoad we are creating an array of data to pass to our Table View.
We have also added two more methods of data source delegate which are mandatory to implement when your implementing UITableViewDataSource delegate.
(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
which specifies how many number of rows are there in one section of the Table View.
The default number of section in Table View is one.
Another method is
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
Which is called by table view when it needs to draw a row. This method is called n times and value of n is equal to value returned by first method. As this method is called once for every row,
if (cell == nil)
checks, if cell exits before, if not create new cell. Here ‘indexPath’ parameter gives us current Indexpath of the row from which we can get the current drawing row. Then we set the text of textLabel property of the current drawing cell and finally return the cell to the Table View.
You can download the source code used in this tutorial from here
Output will look like this:
Output For SimpleTableView