support safeAreaLayoutGuide of iOS 11

@@ -52,6 +52,16 @@
 
 #endif
 
+#if (__IPHONE_OS_VERSION_MAX_ALLOWED >= 110000) || (__TV_OS_VERSION_MAX_ALLOWED >= 110000)
+
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_safeAreaLayoutGuide API_AVAILABLE(ios(11.0),tvos(11.0));
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_safeAreaLayoutGuideTop API_AVAILABLE(ios(11.0),tvos(11.0));
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_safeAreaLayoutGuideBottom API_AVAILABLE(ios(11.0),tvos(11.0));
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_safeAreaLayoutGuideLeft API_AVAILABLE(ios(11.0),tvos(11.0));
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_safeAreaLayoutGuideRight API_AVAILABLE(ios(11.0),tvos(11.0));
+
+#endif
+
 /**
  *	a key to associate with this view
  */

@@ -134,6 +134,26 @@
 
 #endif
 
+#if (__IPHONE_OS_VERSION_MAX_ALLOWED >= 110000) || (__TV_OS_VERSION_MAX_ALLOWED >= 110000)
+
+- (MASViewAttribute *)mas_safeAreaLayoutGuide {
+    return [[MASViewAttribute alloc] initWithView:self item:self.safeAreaLayoutGuide layoutAttribute:NSLayoutAttributeBottom];
+}
+- (MASViewAttribute *)mas_safeAreaLayoutGuideTop {
+    return [[MASViewAttribute alloc] initWithView:self item:self.safeAreaLayoutGuide layoutAttribute:NSLayoutAttributeTop];
+}
+- (MASViewAttribute *)mas_safeAreaLayoutGuideBottom {
+    return [[MASViewAttribute alloc] initWithView:self item:self.safeAreaLayoutGuide layoutAttribute:NSLayoutAttributeBottom];
+}
+- (MASViewAttribute *)mas_safeAreaLayoutGuideLeft {
+    return [[MASViewAttribute alloc] initWithView:self item:self.safeAreaLayoutGuide layoutAttribute:NSLayoutAttributeLeft];
+}
+- (MASViewAttribute *)mas_safeAreaLayoutGuideRight {
+    return [[MASViewAttribute alloc] initWithView:self item:self.safeAreaLayoutGuide layoutAttribute:NSLayoutAttributeRight];
+}
+
+#endif
+
 #pragma mark - associated properties
 
 - (id)mas_key {

@@ -49,6 +49,15 @@
 
 #endif
 
+#if (__IPHONE_OS_VERSION_MAX_ALLOWED >= 110000) || (__TV_OS_VERSION_MAX_ALLOWED >= 110000)
+
+@property (nonatomic, strong, readonly) MASViewAttribute *safeAreaLayoutGuideTop API_AVAILABLE(ios(11.0),tvos(11.0));
+@property (nonatomic, strong, readonly) MASViewAttribute *safeAreaLayoutGuideBottom API_AVAILABLE(ios(11.0),tvos(11.0));
+@property (nonatomic, strong, readonly) MASViewAttribute *safeAreaLayoutGuideLeft API_AVAILABLE(ios(11.0),tvos(11.0));
+@property (nonatomic, strong, readonly) MASViewAttribute *safeAreaLayoutGuideRight API_AVAILABLE(ios(11.0),tvos(11.0));
+
+#endif
+
 - (NSArray *)makeConstraints:(void(^)(MASConstraintMaker *make))block;
 - (NSArray *)updateConstraints:(void(^)(MASConstraintMaker *make))block;
 - (NSArray *)remakeConstraints:(void(^)(MASConstraintMaker *make))block;
@@ -94,6 +103,15 @@ MAS_ATTR_FORWARD(centerYWithinMargins);
 
 #endif
 
+#if (__IPHONE_OS_VERSION_MAX_ALLOWED >= 110000) || (__TV_OS_VERSION_MAX_ALLOWED >= 110000)
+
+MAS_ATTR_FORWARD(safeAreaLayoutGuideTop);
+MAS_ATTR_FORWARD(safeAreaLayoutGuideBottom);
+MAS_ATTR_FORWARD(safeAreaLayoutGuideLeft);
+MAS_ATTR_FORWARD(safeAreaLayoutGuideRight);
+
+#endif
+
 - (MASViewAttribute *(^)(NSLayoutAttribute))attribute {
     return [self mas_attribute];
 }