執(zhí)行animateWithDuration的動(dòng)畫(huà)block時(shí)默認(rèn)禁用用戶(hù)交互。可以傳遞一個(gè)options為UIViewAnimationOptionAllowUserInteraction惶我，允許視圖在動(dòng)畫(huà)中響應(yīng)事件
[UIView animateWithDuration:2.0 delay:0.0 options:UIViewAnimationOptionCurveLinear | UIViewAnimationOptionAllowUserInteraction animations:^{
sv.alpha = 0.1;
} completion:nil];
