在FTP中上传图片,在上传之前想检测一下是PNG格式还是JPG格式,如果不是这两个格式,就出现一个警告。我试过用下面代码,但是格式符合警告也会出现。怎么样才能实现检测?
NSLog(@"%@",filePath.pathExtension);
if( ![filePath.pathExtension isEqualToString:@"png"] || ![filePath.pathExtension isEqualToString:@"jpg"] || ![filePath.pathExtension isEqualToString:@"PNG"] ||![filePath.pathExtension isEqualToString:@"JPG"] )
{
UIAlertView *alert = [[[UIAlertView alloc]initWithTitle:@"Warning" message:@"Image should be in png or jpg format to upload" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil]autorelease];
[alert show];
}