ios 7 Autolayout bug

ios 7 Autolayout bug

错误类型：NSInternalInconsistencyException(SIGABRT)
详情：Auto Layout still required after executing -layoutSubviews. MttFeedsVideoActionBar's implementation of -layoutSubviews needs to call super.

根据提示，在使用autolayout的场景下，actionbar的layoutsubview（）方法里，须要在[super layoutsubviews（）] 调用以前，先调用autolayout的约束方法，因此就这么处理：

- (void)layoutSubviews
{
    if([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) {
        [super layoutSubviews];
    }
    //code needs to be excuted
    [self setLayout];
    if([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) {
        [super layoutSubviews];
    }
}