食谱带有按手势移动台查看单元格moving table view cells with long press gesture用长媒体.pdfVIP

|RayWenderlich14-5-13��5:40

Cookbook:MovingTableViewCells

withaLongPressGesture

SoheilAzarpouronMarch25,2014

Inthiscookbook-styletutorialyouwilllearnhowto

moveatableviewrowbyusingalongpressgesture,

likeinApple’sWeatherApp.

Youcaneitheraddthiscodedirectlytoyourproject,

addittoastarterprojectI’vemadeforyou,orjust

downloadthecompletedexample.

Whatdoyouneed?

UILongGestureRecognizer

UITableView(itcanbesubstitutedwithUICol-

lectionView)

UITableViewController(itcanbesubstituted

withUIViewControllerorUICollectionViewCon-

troller)

5minutes.

Cookbook:Movetableviewcellswithalongpressges-

Howtodoit?ture!

StartbyaddingaUILongGestureRecognizerUILongGestureRecognizer

tothetableview.YoucandothisinviewDidLoadviewDidLoad

foryourtableviewcontroller.

UILongPressGestureRecognizer*longPress=[[UILongPressGestureRecognizeralloc]

initWithTarget:selfaction:@selector(longPressGestureRecognized:)];

[self.tableViewaddGestureRecognizer:longPress];

Nextaddtheactionmethodforgesturerecognizer.Itshouldstartbygettingthelocationofthelongpressintheta-

bleview,andfindthecorrespondingindexpathforthecellatthatlocation.Remembertheindexpathmightbenil

(forexample,iftheusertapsandholdsonasectionheaderofthetableview).

-(IBAction)longPressGestureRecognized:(id)sender{

UILongPressGestureRecognizer*longPress=(UILongPressGestureRecognizer*)sender;

UIGestureRecognizerStatestate=longPress.state;

CGPointlocation=[longPresslocationInView:self.tableView];

NSIndexPath*indexPath=[self.tableViewindexPathForRowAtPoint:loc