1.blockskit
https://github.com/zwaldowski/BlocksKit
bk_showAlertViewWithTitle
2.toast
+(void)showToast:(NSString *)title inView:(UIView *)view{
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:view animated:YES];
hud.mode = MBProgressHUDModeText;
hud.labelText = title;
hud.margin = .f;
hud.yOffset = (kScreen_Height/)-;
hud.removeFromSuperViewOnHide = YES;
[hud hide:YES afterDelay:1.0];
}
3.dispatch_group_create