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//NSDictionary等类有这么一个方法
- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile;
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDir = [documentPaths objectAtIndex:0];
NSString *TmpDoc = [NSString stringWithFormat:@"%@/Temp",documentDir];
if ([[NSFileManager defaultManager] fileExistsAtPath:TmpDoc]==YES) {
[[NSFileManager defaultManager] removeItemAtPath:TmpDoc error:nil];
}
[[NSFileManager defaultManager] createDirectoryAtPath:TmpDoc withIntermediateDirectories:YES attributes:nil error:nil];