新增mj_scrollDirection，mj_scrollDistance

MJRefresh/UIScrollView+MJExtension.h

@@ -22,4 +22,17 @@
 
 @property (assign, nonatomic) CGFloat mj_contentW;
 @property (assign, nonatomic) CGFloat mj_contentH;
+
+/** Ma.).Mi ✎
+ * 首页tabbar滚动隐藏新策略
+ * @1. 根据滚动距离判断
+ * @2. 根据滚动方向判断
+ * ps: 希望能加入到扩展当中，不用再维护previousOffsetY临时变量。😊
+ */
+typedef NS_ENUM(NSInteger, ScrollDirection) {
+ None = 0, Top, Left, Bottom, Right
+};
+@property (nonatomic, assign, readonly) NSInteger mj_scrollDistance;
+@property (nonatomic, assign, readonly) ScrollDirection mj_scrollDirection;
+
 @end

MJRefresh/UIScrollView+MJExtension.m

@@ -152,5 +152,90 @@ - (CGFloat)mj_contentH
 {
  return self.contentSize.height;
 }
+
+/** Ma.).Mi ✎
+ * 每次 scrollview 滑动的方向
+ */
+- (ScrollDirection)mj_scrollDirection {
+ NSInteger distance = self.mj_scrollDistance;
+ /** Ma.).Mi ✎
+ * 如果是 UITableView
+ */
+ if ([self.delegate respondsToSelector:@selector(tableView:numberOfRowsInSection:)] || [self.delegate respondsToSelector:@selector(numberOfSectionsInTableView:)]) {
+ return distance > 0 ? Bottom : (distance != 0 ? Top : None);
+ } else {
+ if (self.mj_offsetX > self.mj_offsetY) {
+ return distance > 0 ? Right : (distance != 0 ? Left : None);
+ } else {
+ return distance > 0 ? Bottom : (distance != 0 ? Top : None);
+ }
+ }
+}
+
+/** Ma.).Mi ✎
+ * 每次 scrollview 滑动的距离
+ */
+- (NSInteger)mj_scrollDistance {
+ if (self.mj_offsetY > 0) {
+ /** Ma.).Mi ✎
+ * 如果是 UITableView
+ */
+ if ([self.delegate respondsToSelector:@selector(tableView:numberOfRowsInSection:)] || [self.delegate respondsToSelector:@selector(numberOfSectionsInTableView:)]) {
+ return ABS(self.mj_offsetY) - ABS(self.mj_previousOffsetY) + self._setPreviousOffsetY;
+ } else {
+ if (self.mj_offsetX > self.mj_offsetY) {
+ return ABS(self.mj_offsetX) - ABS(self.mj_previousOffsetX) + self._setPreviousOffsetX;
+ } else {
+ return ABS(self.mj_offsetY) - ABS(self.mj_previousOffsetY) + self._setPreviousOffsetY;
+ }
+ }
+ } else if (self.mj_offsetY < 0) {
+ return self.mj_offsetY;
+ } else {
+ return 0;
+ }
+}
+
+/** Ma.).Mi ✎
+ * previous contentOffset.y
+ */
+- (CGFloat)mj_previousOffsetY {
+ id value = objc_getAssociatedObject(self, _cmd);
+ if (value) {
+ CGFloat value_float = ((NSNumber *)value).floatValue;
+ return value_float;
+ } else {
+ objc_setAssociatedObject(self, _cmd, [NSNumber numberWithFloat:self.mj_offsetY], OBJC_ASSOCIATION_RETAIN);
+ }
+
+ return 0;
+}
+
+/** Ma.).Mi ✎
+ * previous contentOffset.x
+ */
+- (CGFloat)mj_previousOffsetX {
+ id value = objc_getAssociatedObject(self, _cmd);
+ if (value) {
+ CGFloat value_float = ((NSNumber *)value).floatValue;
+ return value_float;
+ } else {
+ objc_setAssociatedObject(self, _cmd, [NSNumber numberWithFloat:self.mj_offsetX], OBJC_ASSOCIATION_RETAIN);
+ }
+
+ return 0;
+}
+
+#pragma mark #Ma.).Mi# - private method
+- (int)_setPreviousOffsetX {
+ objc_setAssociatedObject(self, @selector(mj_previousOffsetX), [NSNumber numberWithFloat:self.mj_offsetX], OBJC_ASSOCIATION_RETAIN);
+ return 0;
+}
+
+- (int)_setPreviousOffsetY {
+ objc_setAssociatedObject(self, @selector(mj_previousOffsetY), [NSNumber numberWithFloat:self.mj_offsetY], OBJC_ASSOCIATION_RETAIN);
+ return 0;
+}
+
 @end
 #pragma clang diagnostic pop