教你删除子试图

for(UIView *subview in [view subviews]) {
    [subview removeFromSuperview];
}

for(UIView *subview in [view subviews]) {
    if([subview isKindOfClass:[UIButton class]]) {
        [subview removeFromSuperview];
    } else {
        // Do nothing - not a UIButton or subclass instance
    }
}