Fix typo.

MJRefresh/Base/MJRefreshAutoFooter.h

@@ -19,7 +19,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (assign, nonatomic, getter=isAutomaticallyRefresh) BOOL automaticallyRefresh;
 
 /** 当底部控件出现多少时就自动刷新(默认为1.0，也就是底部控件完全出现时，才会自动刷新) */
-@property (assign, nonatomic) CGFloat appearencePercentTriggerAutoRefresh MJRefreshDeprecated("请使用triggerAutomaticallyRefreshPercent属性");
+@property (assign, nonatomic) CGFloat appearancePercentTriggerAutoRefresh MJRefreshDeprecated("请使用triggerAutomaticallyRefreshPercent属性");
 
 /** 当底部控件出现多少时就自动刷新(默认为1.0，也就是底部控件完全出现时，才会自动刷新) */
 @property (assign, nonatomic) CGFloat triggerAutomaticallyRefreshPercent;

MJRefresh/Base/MJRefreshAutoFooter.m

@@ -40,12 +40,12 @@ - (void)willMoveToSuperview:(UIView *)newSuperview
 }
 
 #pragma mark - 过期方法
-- (void)setAppearencePercentTriggerAutoRefresh:(CGFloat)appearencePercentTriggerAutoRefresh
+- (void)setAppearancePercentTriggerAutoRefresh:(CGFloat)appearancePercentTriggerAutoRefresh
 {
-    self.triggerAutomaticallyRefreshPercent = appearencePercentTriggerAutoRefresh;
+    self.triggerAutomaticallyRefreshPercent = appearancePercentTriggerAutoRefresh;
 }
 
-- (CGFloat)appearencePercentTriggerAutoRefresh
+- (CGFloat)appearancePercentTriggerAutoRefresh
 {
     return self.triggerAutomaticallyRefreshPercent;
 }