From 019a979bfeb213a799222785ff39e8a793afda07 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Minh=20Nguy=E1=BB=85n?= <mxn@1ec5.org>
Date: Fri, 6 Nov 2015 17:26:48 -0800
Subject: Remove constraints instead of deactivating them

Avoid piling up lots of deactivated constraints. Also avoid trying to deactivate constraints that have already been removed from the view hierarchy due to a change in view controllers.

Fixes #2020.
---
 platform/ios/MGLMapView.mm | 58 +++++++---------------------------------------
 1 file changed, 8 insertions(+), 50 deletions(-)

(limited to 'platform/ios/MGLMapView.mm')

diff --git a/platform/ios/MGLMapView.mm b/platform/ios/MGLMapView.mm
index 4caf043811..942c6563de 100644
--- a/platform/ios/MGLMapView.mm
+++ b/platform/ios/MGLMapView.mm
@@ -534,14 +534,7 @@ std::chrono::steady_clock::duration secondsAsDuration(float duration)
     // compass
     //
     UIView *compassContainer = self.compassView.superview;
-    if ([NSLayoutConstraint respondsToSelector:@selector(deactivateConstraints:)])
-    {
-        [NSLayoutConstraint deactivateConstraints:compassContainer.constraints];
-    }
-    else
-    {
-        [compassContainer removeConstraints:compassContainer.constraints];
-    }
+    [compassContainer removeConstraints:compassContainer.constraints];
 
     NSMutableArray *compassContainerConstraints = [NSMutableArray array];
     if (viewController)
@@ -573,7 +566,7 @@ std::chrono::steady_clock::duration secondsAsDuration(float duration)
                                  multiplier:1
                                    constant:5]];
 
-    [compassContainer addConstraint:
+    [compassContainerConstraints addObject:
      [NSLayoutConstraint constraintWithItem:compassContainer
                                   attribute:NSLayoutAttributeWidth
                                   relatedBy:NSLayoutRelationEqual
@@ -582,7 +575,7 @@ std::chrono::steady_clock::duration secondsAsDuration(float duration)
                                  multiplier:1
                                    constant:self.compassView.image.size.width]];
 
-    [compassContainer addConstraint:
+    [compassContainerConstraints addObject:
      [NSLayoutConstraint constraintWithItem:compassContainer
                                   attribute:NSLayoutAttributeHeight
                                   relatedBy:NSLayoutRelationEqual
@@ -590,25 +583,11 @@ std::chrono::steady_clock::duration secondsAsDuration(float duration)
                                   attribute:NSLayoutAttributeNotAnAttribute
                                  multiplier:1
                                    constant:self.compassView.image.size.height]];
-    if ([NSLayoutConstraint respondsToSelector:@selector(activateConstraints:)])
-    {
-        [NSLayoutConstraint activateConstraints:compassContainerConstraints];
-    }
-    else
-    {
-        [constraintParentView addConstraints:compassContainerConstraints];
-    }
+    [constraintParentView addConstraints:compassContainerConstraints];
 
     // logo bug
     //
-    if ([NSLayoutConstraint respondsToSelector:@selector(deactivateConstraints:)])
-    {
-        [NSLayoutConstraint deactivateConstraints:self.logoViewConstraints];
-    }
-    else
-    {
-        [self.logoView removeConstraints:self.logoViewConstraints];
-    }
+    [self.logoView removeConstraints:self.logoViewConstraints];
     [self.logoViewConstraints removeAllObjects];
     if (viewController)
     {
@@ -638,25 +617,11 @@ std::chrono::steady_clock::duration secondsAsDuration(float duration)
                                   attribute:NSLayoutAttributeLeading
                                  multiplier:1
                                    constant:8]];
-    if ([NSLayoutConstraint respondsToSelector:@selector(activateConstraints:)])
-    {
-        [NSLayoutConstraint activateConstraints:self.logoViewConstraints];
-    }
-    else
-    {
-        [constraintParentView addConstraints:self.logoViewConstraints];
-    }
+    [constraintParentView addConstraints:self.logoViewConstraints];
 
     // attribution button
     //
-    if ([NSLayoutConstraint respondsToSelector:@selector(deactivateConstraints:)])
-    {
-        [NSLayoutConstraint deactivateConstraints:self.attributionButtonConstraints];
-    }
-    else
-    {
-        [self.attributionButton removeConstraints:self.attributionButtonConstraints];
-    }
+    [self.attributionButton removeConstraints:self.attributionButtonConstraints];
     [self.attributionButtonConstraints removeAllObjects];
     if (viewController)
     {
@@ -686,14 +651,7 @@ std::chrono::steady_clock::duration secondsAsDuration(float duration)
                                   attribute:NSLayoutAttributeTrailing
                                  multiplier:1
                                    constant:8]];
-    if ([NSLayoutConstraint respondsToSelector:@selector(activateConstraints:)])
-    {
-        [NSLayoutConstraint activateConstraints:self.attributionButtonConstraints];
-    }
-    else
-    {
-        [constraintParentView addConstraints:self.attributionButtonConstraints];
-    }
+    [constraintParentView addConstraints:self.attributionButtonConstraints];
 
     [super updateConstraints];
 }
-- 
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