これをネットで探していたのですが、やっと自作できました。アプリを 3 回目に開いた後にリマインダーを表示するには、viewdidload にコピーするだけです
NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *documents = [path objectAtIndex:0];
NSString *counterPath = [documents stringByAppendingPathComponent:@"counter.txt"];
NSString *number = [NSString stringWithContentsOfFile:counterPath encoding:NSUTF8StringEncoding error:nil];
int numberint = [number intValue];
int opens = numberint + 1;
NSString *dataString = [NSString stringWithFormat:@"%d", opens];
NSData *data = [dataString dataUsingEncoding:NSUTF8StringEncoding];
[data writeToFile:counterPath atomically:YES];
if (opens == 3 ) {
UIAlertView *myAlert = [[UIAlertView alloc]
initWithTitle:@"*****" message:@"Please Rate 5 Stars to Support MY APP"
delegate:self
cancelButtonTitle:nil
otherButtonTitles:@"OK",nil];
[myAlert show];
}