[ios] Fix ornaments' view constraints bug in bold-text mode (#57)

* [ios] fix bold text reset view's bounds issue

* [ios]add change log

platform/ios/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 Mapbox welcomes participation and contributions from everyone. Please read [CONTRIBUTING.md](../../CONTRIBUTING.md) to get started.
 
+## master
+
+* Fix ornaments' view constraints bug when devices change to bold-text mode. ([#57](https://github.com/mapbox/mapbox-gl-native-ios/pull/57))
+
 ## 5.5.0 - November 5, 2019
 
 ### Performance improvements

platform/ios/src/MGLMapView.mm

@@ -889,8 +889,11 @@ public:
     }
 
     if (!CGSizeEqualToSize(size, CGSizeZero)) {
-        [updatedConstraints addObject:[view.widthAnchor constraintEqualToConstant:size.width]];
-        [updatedConstraints addObject:[view.heightAnchor constraintEqualToConstant:size.height]];
+        NSLayoutConstraint *widthConstraint = [view.widthAnchor constraintEqualToConstant:size.width];
+        widthConstraint.identifier = @"width";
+        NSLayoutConstraint *heightConstraint = [view.heightAnchor constraintEqualToConstant:size.height];
+        heightConstraint.identifier = @"height";
+        [updatedConstraints addObjectsFromArray:@[widthConstraint,heightConstraint]];
     }
     
     [NSLayoutConstraint deactivateConstraints:constraints];
@@ -912,7 +915,7 @@ public:
     [self updateConstraintsForOrnament:self.compassView
                            constraints:self.compassViewConstraints
                               position:self.compassViewPosition
-                                  size:self.compassView.bounds.size
+                                  size:[self sizeForOrnament:self.compassView constraints:self.compassViewConstraints]
                                margins:self.compassViewMargins];
 }
 
@@ -930,7 +933,7 @@ public:
     [self updateConstraintsForOrnament:self.logoView
                            constraints:self.logoViewConstraints
                               position:self.logoViewPosition
-                                  size:self.logoView.bounds.size
+                                  size:[self sizeForOrnament:self.logoView constraints:self.logoViewConstraints]
                                margins:self.logoViewMargins];
 }
 
@@ -939,10 +942,31 @@ public:
     [self updateConstraintsForOrnament:self.attributionButton
                            constraints:self.attributionButtonConstraints
                               position:self.attributionButtonPosition
-                                  size:self.attributionButton.bounds.size
+                                  size:[self sizeForOrnament:self.attributionButton constraints:self.attributionButtonConstraints]
                                margins:self.attributionButtonMargins];
 }
 
+- (CGSize)sizeForOrnament:(UIView *)view
+              constraints:(NSMutableArray *)constraints {
+    // avoid regenerating size constraints
+    CGSize size;
+    if(constraints && constraints.count > 0) {
+        for (NSLayoutConstraint * constraint in constraints) {
+            if([constraint.identifier isEqualToString:@"width"]) {
+                size.width = constraint.constant;
+            }
+            else if ([constraint.identifier isEqualToString:@"height"]) {
+                size.height = constraint.constant;
+            }
+        }
+    }
+    else {
+        size = view.bounds.size;
+    }
+    
+    return size;
+}
+
 - (BOOL)isOpaque
 {
     return _opaque;