objective c - Deleteing more than one file from iphone documents folder? -

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my iphone application saving photos document folder. want delete these file form document folder after use. know how delete 1 file @ time using path 

if ([filemgr removeitematpath:filepath error:&error] != yes)     nslog(@"unable delete file: %@", [error localizeddescription]);

but want delete file in 1 go. files in .png format tried out *.png not working. 

/* dir: directory files */ nsfilemanager *fm = [nsfilemanager defaultmanager]; nserror *error = nil; nsarray *items = [fm contentsofdirectoryatpath:dir error:&error]; if (error) { /* ... */ }  /* delete png files */ (nsstring *item in items) {     if ([[item pathextension] isequaltostring:@"png"]) {         nsstring *path = [dir stringbyappendingpathcomponent:item];         [fm removeitematpath:path error:&error];         if (error)             { /* ... */ }     } }

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