iOS detects whether a file with a specified path exists

Source: Internet
Author: User
Tags bool create directory

This article to share is in the development of iOS to detect the existence of a specified file method, for everyone summed up 4 kinds, very practical, small partners according to their own needs free choice.

The code is as follows:

-(NSString *) DataPath: (NSString *) file

{

NSString *path = [[Nshomedirectory () stringbyappendingpathcomponent:@ "Documents"] stringbyappendingpathcomponent:@ " Badge "];

BOOL bo = [[Nsfilemanager Defaultmanager] Createdirectoryatpath:path withintermediatedirectories:yes attributes:nil Error:nil];

Nsassert (bo,@ "Create directory Failed");

NSString *result = [path stringbyappendingpathcomponent:file];

return result;

}

-(void) viewdidload

{

[Super Viewdidload];

The picture access path is first specified (written in the application sandbox by default)

Nsarray *paths = Nssearchpathfordirectoriesindomains (Nsdocumentdirectory,nsuserdomainmask, YES);

and give the file a filename

NSString *imagedir = [[[Paths objectatindex:0] stringbyappendingpathcomponent:@ "163"] stringbyappendingpathcomponent : @ "Songzi"];

folder where pictures are stored

NSString *imagepath =[imagedir stringbyappendingpathcomponent:@ "filename. png"];

NSData *data = nil;

Check to see if the picture has been saved locally

if ([self isexistsfile:imagepath]) {

Data=[nsdata Datawithcontentsoffile:imagepath];

}else{

data = [NSData datawithcontentsofurl:[nsurl urlwithstring: @ "url"]];

Create a folder path

[[Nsfilemanager Defaultmanager] Createdirectoryatpath:imagedir withintermediatedirectories:yes attributes:nil Error : nil];

Create a picture

[Uiimagepngrepresentation ([UIImage imagewithdata:data]) Writetofile:imagepath Atomically:yes];

}

Imageview.image = [UIImage imagewithdata:data];

}

Check to see if a file exists

The code is as follows:

NSString *path = [[NSBundle mainbundle] Pathforresource:filename oftype:@ "];

if (path==null)

Method Two:

The code is as follows:

Nsfilemanager *filemanager = [Nsfilemanager Defaultmanager];

Get Documents Directory

Nsarray *directorypaths = Nssearchpathfordirectoriesindomains

(NSDocumentDirectory, Nsuserdomainmask, YES);

NSString *documentsdirectorypath = [Directorypaths objectatindex:0];

if ([FileManager fileexistsatpath:@ ""]==yes) {

NSLog (@ "File exists");

}

Method Three:

The code is as follows:

To determine whether a file exists

if (![ C judgefileexist:@ "User.plist"])

{

NSLog (Please confirm the file exists!);

Return

}

Method Four:

The code is as follows:

To determine whether a file exists

-(BOOL) Judgefileexist: (NSString *) fileName

{

Get file path

NSString *path = [[NSBundle mainbundle] Pathforresource:filename oftype:@ "];

if (path==null)

return NO;

Returnyes;

}

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