Added defaultSource for IOS

Author: IjzerenHein

ios/FirebaseUIImageView.h

@@ -15,5 +15,6 @@
 @property (nonatomic, copy) NSString *path;
 @property (nonatomic, strong) NSNumber *timestamp;
 @property (nonatomic, assign) RCTResizeMode resizeMode;
+@property (nonatomic, strong) UIImage *defaultSource;
 
 @end

ios/FirebaseUIImageView.m

@@ -19,22 +19,29 @@ @implementation FirebaseImageView
 - (void)setPath:(NSString *)path
 {
     _path = path;
+    
+    _needsReload = YES;
+}
 
+- (void)setDefaultSource:(UIImage *)defaultSource
+{
+    _defaultSource = defaultSource;
+    
     _needsReload = YES;
 }
 
 -(void)setTimestamp:(NSNumber*)timestamp
 {
     _timestamp = timestamp;
-
+    
     _needsReload = YES;
 }
 
 - (void)setResizeMode:(RCTResizeMode)resizeMode
 {
     if (_resizeMode != resizeMode) {
         _resizeMode = resizeMode;
-
+        
         if (_resizeMode == RCTResizeModeRepeat) {
             // Repeat resize mode is handled by the UIImage. Use scale to fill
             // so the repeated image fills the UIImageView.
@@ -59,10 +66,10 @@ -(void)reloadImage
     _needsReload = NO;
     // Reference to an image file in Firebase Storage
     FIRStorageReference *reference = [[FIRStorage storage] referenceWithPath:_path];
-
+    
     // Load the image using SDWebImage
     NSString* timestamp = [_timestamp stringValue];
-    [self sd_setImageWithStorageReference:reference customKey:timestamp];
+    [self sd_setImageWithStorageReference:reference placeholderImage:_defaultSource customKey:timestamp];
 }
 
 @end

ios/RCTFirebaseImageViewManager.m

@@ -16,12 +16,12 @@ @implementation RCTFirebaseImageViewManager
 RCT_EXPORT_VIEW_PROPERTY(path, NSString)
 RCT_EXPORT_VIEW_PROPERTY(timestamp, NSNumber)
 RCT_EXPORT_VIEW_PROPERTY(resizeMode, RCTResizeMode)
-
+RCT_EXPORT_VIEW_PROPERTY(defaultSource, UIImage)
 
 - (UIView *)view
 {
     FirebaseImageView *imageView = [[FirebaseImageView alloc] init];
-
+    
     return imageView;
 }
 

ios/UIImageView+FirebaseStorage.h

@@ -60,6 +60,7 @@ NS_ASSUME_NONNULL_BEGIN
  *   could not be found in cache).
  */
 - (nullable FIRStorageDownloadTask *)sd_setImageWithStorageReference:(FIRStorageReference *)storageRef
+                                                    placeholderImage:(nullable UIImage *)placeholder
                                                     customKey:(NSString*)customKey;
 
 /**

ios/UIImageView+FirebaseStorage.m

@@ -39,10 +39,11 @@ - (FIRStorageDownloadTask *)sd_setImageWithStorageReference:(FIRStorageReference
 }
 
 - (FIRStorageDownloadTask *)sd_setImageWithStorageReference:(FIRStorageReference *)storageRef
+                                           placeholderImage:(nullable UIImage *)placeholder
                                            customKey:(NSString*)customKey {
   return [self sd_setImageWithStorageReference:storageRef
                                   maxImageSize:[UIImageView sd_defaultMaxImageSize]
-                              placeholderImage:nil
+                              placeholderImage:placeholder
                                          cache:[SDImageCache sharedImageCache]
                                     completion:nil
                                     customKey:customKey];