fileManager why not delete the file, it can not cover

 

NSString * realPath = [NSHomeDirectory () stringByAppendingPathComponent: @ "Documents / xx.sqlite"]; 

NSError * error; 
NSURL * url = [NSURL URLWithString: realPath]; 
if ([fileManager fileExistsAtPath: realPath]) {
NSLog (@ "file exists"); 
[FileManager removeItemAtURL: url error: & error] ;/ / not delete oh 

NSLog (@ "error =% @", error); 
} 

if ([fileManager copyItemAtPath: sourcePath toPath: realPath error: & error]!) 
{/ / As long as you can not copy the file exists, it can not be overwritten. 
NSLog (@ "% @", [error localizedDescription]); 
} 
else {
NSLog (@ "% @ successfully copied to the path:% @.", SourcePath, realPath); 
} 

Reply:
Seems to be a database file, other threads may be accessed, so can not be deleted. You try to change a file.

Reply:
How can you delete a path with NSURL?
NSString path directly delete ah.

Please refer to the following:
http://blog.csdn.net/cxsjabcabc/article/details/7167729