【移動應(yīng)用開發(fā)技術(shù)】iOS中3DTouch預(yù)覽導(dǎo)致TableView滑動卡頓怎么辦

【移動應(yīng)用開發(fā)技術(shù)】iOS中3DTouch預(yù)覽導(dǎo)致TableView滑動卡頓怎么辦

1.發(fā)現(xiàn)問題/upload/information/20200623/126/119526.gif2.排除問題///行高寫死后依舊卡頓

-

(CGFloat)tableView:(UITableView

*)tableView

heightForRowAtIndexPath:(NSIndexPath

*)indexPath

{

//return

[self.tableView

cellHeightForIndexPath:indexPath

model:self.dataArray[indexPath.row]

keyPath:@"model"

cellClass:[JstyleNewsOnePlusImageVideoViewCell

class]

contentViewWidth:kScreenWidth];

return

200;

}-

(UITableViewCell

*)tableView:(UITableView

*)tableView

cellForRowAtIndexPath:(NSIndexPath

*)indexPath

{

//省略部分防崩潰判斷代碼...

JstyleNewsHomePageModel

*model

=

self.dataArray[indexPath.row];

switch

([model.type

integerValue])

{

case

1:{

if

([model.head_type

integerValue]

==

1

&&

[model.isImageArticle

integerValue]

==

1)

{

static

NSString

*ID

=

@"JstyleNewsOnePlusImageArticleViewCell";

/*換一種Cell復(fù)用方法，效果依舊卡頓，證明TableViewCell復(fù)用沒有問題。

JstyleNewsOnePlusImageArticleViewCell

*cell

=

[tableView

dequeueReusableCellWithIdentifier:ID];

if

(!cell)

{

cell

=

[[JstyleNewsOnePlusImageArticleViewCell

alloc]initWithStyle:UITableViewCellStyleSubtitle

reuseIdentifier:ID];

}

*/

JstyleNewsOnePlusImageArticleViewCell

*cell

=

[tableView

dequeueReusableCellWithIdentifier:ID

forIndexPath:indexPath];

///劇透：卡頓的原因就在這！Cell重復(fù)注冊3DTouch預(yù)覽！后面會說解決辦法。

[self

registerForPreviewingWithDelegate:self

sourceView:cell];

if

(indexPath.row

<

self.dataArray.count)

{

cell.model

=

model;

}

cell.selectionStyle

=

UITableViewCellSelectionStyleNone;

return

cell;

}

//else

if...

//case

2:...

}/upload/information/20200623/126/119527.jpg3.定位問題#pragma

mark

-

3DTouch預(yù)覽

-

(UIViewController

*)previewingContext:(id<UIViewControllerPreviewing>)previewingContext

viewControllerForLocation:(CGPoint)location

{

NSIndexPath

*indexPath

=

[self.tableView

indexPathForCell:(UITableViewCell*

)[previewingContext

sourceView]];

if

([self.dataArray[indexPath.row]

isImageArticle].integerValue

==

1)

{

JstylePictureTextViewController

*pictureVC

=

[[JstylePictureTextViewController

alloc]

init];

if

(indexPath.row

<

self.dataArray.count)

{

pictureVC.rid

=

[self.dataArray[indexPath.row]

id];

CGRect

rect

=

CGRectMake(0,

0,

self.view.frame.size.width,[self.tableView

cellForRowAtIndexPath:indexPath].height);

previewingContext.sourceRect

=

rect;

}

return

pictureVC;

}

else

{

JstyleNewsArticleDetailViewController

*detailVC

=

[[JstyleNewsArticleDetailViewController

alloc]

init];

detailVC.preferredContentSize

=

CGSizeMake(0.0f,500.0f);

if

(indexPath.row

<

self.dataArray.count)

{

detailVC.rid

=

[self.dataArray[indexPath.row]

id];

detailVC.titleModel

=

self.detailDataArray[indexPath.row];

CGRect

rect

=

CGRectMake(0,

0,

self.view.frame.size.width,[self.tableView

cellForRowAtIndexPath:indexPath].height);

previewingContext.sourceRect

=

rect;

}

return

detailVC;

}

}-

(UITableViewCell

*)tableView:(UITableView

*)tableView

cellForRowAtIndexPath:(NSIndexPath

*)indexPath

{

static

NSString

*ID

=

@"JstyleNewsOnePlusImageArticleViewCell";

JstyleNewsOnePlusImageArticleViewCell

*cell

=

[tableView

dequeueReusableCellWithIdentifier:ID];

if

(!cell)

{

cell

=

[[JstyleNewsOnePlusImageArticleViewCell

alloc]initWithStyle:UITableViewCellStyleSubtitle

reuseIdentifier:ID];

}

//?。?！是他是他就是他?。?！每一次滑動TableView復(fù)用Cell的時候都會注冊一遍3DTouch代理！不卡才怪了！

//[self

registerForPreviewingWithDelegate:self

sourceView:cell];注釋掉之后，瞬間“縱享絲滑”！

if

(indexPath.row

<

self.dataArray.count)

{

cell.model

=

model;

}

cell.selectionStyle

=

UITableViewCellSelectionStyleNone;

return

cell;

}4.解決問題//

//

JstyleNewsBaseTableViewCell.h

//

JstyleNews

//

//

Created

by

王磊

on

2018/1/25.

//

Copyright

©

2018年

JstyleNews.

All

rights

reserved.

//

///抽取一個BaseCell基類,后面的子類Cell只需繼承

#import

<UIKit/UIKit.h>

@interface

JstyleNewsBaseTableViewCell

:

UITableViewCell

///是否設(shè)置過3DTouch代理

@property

(nonatomic,

assign

,

readonly)

BOOL

isAllreadySetupPreviewingDelegate;

/**

給當(dāng)前Cell設(shè)置3DTouch代理,方法內(nèi)部自動判定是否已經(jīng)設(shè)置過.

@param

controller

代理控制器

*/

-

(void)setupPreviewingDelegateWithController:(UIViewController<UIViewControllerPreviewingDelegate>

*)controller;

@end//

//

JstyleNewsBaseTableViewCell.m

//

JstyleNews

//

//

Created

by

王磊

on

2018/1/25.

//

Copyright

©

2018年

JstyleNews.

All

rights

reserved.

//

#import

"JstyleNewsBaseTableViewCell.h"

@interface

JstyleNewsBaseTableViewCell

()

///標(biāo)識當(dāng)前Cell是否注冊過

@property

(nonatomic,

assign)

BOOL

isAllreadySetupPreviewingDelegate;

@end

@implementation

JstyleNewsBaseTableViewCell

-

(void)setupPreviewingDelegateWithController:(UIViewController<UIViewControllerPreviewingDelegate>

*)controller

{

if

(self.isAllreadySetupPreviewingDelegate

==

YES)

{

return;

}

if

([self

respondsToSelector:@selector(traitCollection)])

{

if

([self.traitCollection

respondsToSelector:@selector(forceTouchCapability)])

{

if

(self.traitCollection.forceTouchCapability

==

UIForceTouchCapabilityAvailable)

{

[controller

registerForPreviewingWithDelegate:controller

sourceView:self];

self.isAllreadySetupPreviewingDelegate

=

YES;

}

else

{

self.isAllreadySetupPreviewingDelegate

=

NO;

}

}

}

}

-

(BOOL)isAllreadySetupPreviewingDelegate

{

return

_isAllreadySetupPreviewingDelegate;

}-

(UITableViewCell

*)tableView:(UITableView

*)tableView

cellForRowAtIndexPath:(NSIndexPath

*)indexPath

{

//防崩潰代碼省略...

JstyleNewsHomePageModel

*model

=

self.dataArray[indexPath.row];

switch

([model.type

integerValue])

{

case

1:{

if

([model.head_type

integerValue]

==

1

&&

[model.isImageArticle

integerValue]

==

1)

{

static

NSS