@property(nonatomic) BOOL bounces;

设置UIScrollView是否需要弹簧效果

@property(nonatomic,getter=isScrollEnabled) BOOL scrollEnabled;

设置UIScrollView是否能滚动

@property(nonatomic) BOOL showsHorizontalScrollIndicator;

是否显示水平滚动条

@property(nonatomic) BOOL showsVerticalScrollIndicator;

是否显示垂直滚动条