viaLondon的部落格

在某個view controller埋下以下程式碼，邀請使用者為iOS app評分或是稍後提醒使用者給予評分。

最基本的方法：

@interface ViewController () <UIAlertViewDelegate>
// ...
@end

@implementation ViewController
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    switch (alertView.tag) {
        case YOUR_APP_ID:
        {
            NSDate * now = [[NSDate alloc] init];
            switch (buttonIndex) {
                case 1: // YES
                    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"itms-apps://itunes.apple.com/app/id%d", alertView.tag]]];
                    [[NSUserDefaults standardUserDefaults] setObject:now forKey:@"rateDone"];
                    break;

                case 2: // Remind me later
                    [[NSUserDefaults standardUserDefaults] setObject:now forKey:@"rateDate"];
                    break;

                default: // NO
                    [[NSUserDefaults standardUserDefaults] setObject:now forKey:@"rateDone"];
                    break;
            }
            [[NSUserDefaults standardUserDefaults] synchronize];
        }
            break;
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    @try {
        if (![[NSUserDefaults standardUserDefaults] objectForKey:@"rateDone"]) {
            NSDate * now = [[NSDate alloc] init];
            if (![[NSUserDefaults standardUserDefaults] objectForKey:@"rateDate"]) {
                [[NSUserDefaults standardUserDefaults] setObject:now forKey:@"rateDate"];
                [[NSUserDefaults standardUserDefaults] synchronize];

                    UIAlertView *alterView = [[UIAlertView alloc] initWithTitle:@"Rate this app" 
message:@"If you enjoy using this app, would you mind taking a moment to rate it?" 
delegate:self 
cancelButtonTitle:@"NO, Thanks" 
otherButtonTitles:@"YES", @"Remind me later", nil];
                    alterView.tag = YOUR_APP_ID;
                    [alterView show];

            } else {
                NSDate *prevDate = [[NSUserDefaults standardUserDefaults] objectForKey:@"rateDate"];
                if ([now timeIntervalSinceDate:prevDate] > 60 * 60 * 10) {
                    UIAlertView *alterView = [[UIAlertView alloc] initWithTitle:@"Rate this app"
message:@"If you enjoy using this app, would you mind taking a moment to rate it?"
delegate:self
cancelButtonTitle:@"NO, Thanks"
otherButtonTitles:@"YES", @"Remind me later", nil];
                    alterView.tag = YOUR_APP_ID;
                    [alterView show];
                }
            }
        }
    }
    @catch (NSException *exception) {
    }
    @finally {
    }
}

@end