iOS--Image download for cell

1. Face Questions

1> How to prevent a URL corresponding to the picture repeated download

* "Cell download Picture idea – there is a sandbox cache"

What is the default cache duration for 2> sdwebimage?

* 1 weeks

3> Sdwebimage How does the bottom layer come true?

* Class ppt "Cell download Picture ideas – there is a sandbox cache"

2.SDWebImage

1> Common methods

-(void) Sd_setimagewithurl: (nsurl *) URL placeholderimage: (UIImage *) placeholder;

-(void) Sd_setimagewithurl: (nsurl *) URL placeholderimage: (UIImage *) placeholder options: (sdwebimageoptions) options;

-(void) Sd_setimagewithurl: (nsurl *) URL placeholderimage: (UIImage *) placeholder completed: ( Sdwebimagecompletionblock) Completedblock;

-(void) Sd_setimagewithurl: (nsurl *) URL placeholderimage: (UIImage *) placeholder options: (sdwebimageoptions) options Progress: (Sdwebimagedownloaderprogressblock) Progressblock completed: (sdwebimagecompletionblock) CompletedBlock;

2> Memory Processing: When the app receives a memory warning

/**

* When the app receives a memory warning

*/

-(void) applicationdidreceivememorywarning: (uiapplication *) application

{

Sdwebimagemanager *mgr = [Sdwebimagemanager Sharedmanager];

1. Cancel the operation being downloaded

[Mgr Cancelall];

2. Clear the Memory cache

[Mgr.imagecache Clearmemory];

}

3> sdwebimageoptions

* sdwebimageretryfailed: After the download fails, it will be automatically re-downloaded

* Sdwebimagelowpriority: Automatically pauses some internal download operations while UI interaction is in progress

* sdwebimageretryfailed | Sdwebimagelowpriority: Has the above 2 functions

iOS--Image download for cell