✏️ Support iOS < 9.0

Author: noblakit01

PhotoCollectionDemo/PhotoCollectionDemo.xcodeproj/project.pbxproj

@@ -277,6 +277,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				INFOPLIST_FILE = PhotoCollectionDemo/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = luantran.PhotoCollectionDemo;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -289,6 +290,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				INFOPLIST_FILE = PhotoCollectionDemo/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = luantran.PhotoCollectionDemo;
 				PRODUCT_NAME = "$(TARGET_NAME)";

PhotoCollectionView/PhotoCollectionView.swift

@@ -100,10 +100,21 @@ open class PhotoCollectionView: UIView {
         label.text = "+\(numMore)"
 
         photoView.addSubview(label)
-        photoView.leftAnchor.constraint(equalTo: label.leftAnchor).isActive = true
-        photoView.rightAnchor.constraint(equalTo: label.rightAnchor).isActive = true
-        photoView.topAnchor.constraint(equalTo: label.topAnchor).isActive = true
-        photoView.bottomAnchor.constraint(equalTo: label.bottomAnchor).isActive = true
+        if #available(iOS 9.0, *) {
+            photoView.leftAnchor.constraint(equalTo: label.leftAnchor).isActive = true
+            photoView.rightAnchor.constraint(equalTo: label.rightAnchor).isActive = true
+            photoView.topAnchor.constraint(equalTo: label.topAnchor).isActive = true
+            photoView.bottomAnchor.constraint(equalTo: label.bottomAnchor).isActive = true
+
+        } else {
+            let constraints = [
+                NSLayoutConstraint(item: label, attribute: .left, relatedBy: .equal, toItem: photoView, attribute: .left, multiplier: 1.0, constant: 0),
+                NSLayoutConstraint(item: label, attribute: .right, relatedBy: .equal, toItem: photoView, attribute: .right, multiplier: 1.0, constant: 0),
+                NSLayoutConstraint(item: label, attribute: .top, relatedBy: .equal, toItem: photoView, attribute: .top, multiplier: 1.0, constant: 0),
+                NSLayoutConstraint(item: label, attribute: .bottom, relatedBy: .equal, toItem: photoView, attribute: .bottom, multiplier: 1.0, constant: 0),
+                ]
+            photoView.addConstraints(constraints)
+        }
     }
 }
 

PhotoCollectionView/PhotoView.swift

@@ -23,10 +23,20 @@ class PhotoView: UIView {
         super.init(frame: frame)
 
         addSubview(imageView)
-        leftAnchor.constraint(equalTo: imageView.leftAnchor).isActive = true
-        rightAnchor.constraint(equalTo: imageView.rightAnchor).isActive = true
-        topAnchor.constraint(equalTo: imageView.topAnchor).isActive = true
-        bottomAnchor.constraint(equalTo: imageView.bottomAnchor).isActive = true
+        if #available(iOS 9.0, *) {
+            leftAnchor.constraint(equalTo: imageView.leftAnchor).isActive = true
+            rightAnchor.constraint(equalTo: imageView.rightAnchor).isActive = true
+            topAnchor.constraint(equalTo: imageView.topAnchor).isActive = true
+            bottomAnchor.constraint(equalTo: imageView.bottomAnchor).isActive = true
+        } else {
+            let constraints = [
+                NSLayoutConstraint(item: imageView, attribute: .left, relatedBy: .equal, toItem: self, attribute: .left, multiplier: 1.0, constant: 0),
+                NSLayoutConstraint(item: imageView, attribute: .right, relatedBy: .equal, toItem: self, attribute: .right, multiplier: 1.0, constant: 0),
+                NSLayoutConstraint(item: imageView, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1.0, constant: 0),
+                NSLayoutConstraint(item: imageView, attribute: .bottom, relatedBy: .equal, toItem: self, attribute: .bottom, multiplier: 1.0, constant: 0),
+            ]
+            addConstraints(constraints)
+        }
 
         backgroundColor = UIColor.black
     }