Using the lazy property for `lock` and `runLoopMode` to ensure this will not cause crash and logic issue. Without need of checking on `setImage:`

SDWebImage/SDAnimatedImageView.m

@@ -40,7 +40,10 @@ static NSUInteger SDDeviceFreeMemory() {
     return vm_stat.free_count * page_size;
 }
 
-@interface SDAnimatedImageView () <CALayerDelegate>
+@interface SDAnimatedImageView () <CALayerDelegate> {
+    NSRunLoopMode _runLoopMode;
+    BOOL _initFinished; // Extra flag to mark the `commonInit` is called
+}
 
 @property (nonatomic, strong, readwrite) UIImage *currentFrame;
 @property (nonatomic, assign, readwrite) NSUInteger currentFrameIndex;
@@ -62,7 +65,6 @@ static NSUInteger SDDeviceFreeMemory() {
 #else
 @property (nonatomic, strong) CADisplayLink *displayLink;
 #endif
-@property (nonatomic, assign) BOOL hasInitialized;
 
 @end
 
@@ -124,14 +126,10 @@ static NSUInteger SDDeviceFreeMemory() {
 
 - (void)commonInit
 {
-    if (self.hasInitialized) {
-        return;
-    }
-    self.hasInitialized = YES;
-    
+    // Pay attention that UIKit's `initWithImage:` will trigger a `setImage:` during initialization before this `commonInit`.
+    // So the properties which rely on this order, should using lazy-evaluation or do extra check in `setImage:`.
     self.shouldCustomLoopCount = NO;
     self.shouldIncrementalLoad = YES;
-    self.lock = dispatch_semaphore_create(1);
 #if SD_MAC
     self.wantsLayer = YES;
     // Default value from `NSImageView`
@@ -140,9 +138,10 @@ static NSUInteger SDDeviceFreeMemory() {
     self.imageAlignment = NSImageAlignCenter;
 #endif
 #if SD_UIKIT
-    self.runLoopMode = [[self class] defaultRunLoopMode];
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
 #endif
+    // Mark commonInit finished
+    _initFinished = YES;
 }
 
 - (void)resetAnimatedImage
@@ -189,11 +188,6 @@ static NSUInteger SDDeviceFreeMemory() {
         return;
     }
     
-    // Check has initlized
-    if (!self.hasInitialized) {
-        [self commonInit];
-    }
-    
     // Check Progressive rendering
     [self updateIsProgressiveWithImage:image];
     
@@ -251,17 +245,38 @@ static NSUInteger SDDeviceFreeMemory() {
 }
 
 #if SD_UIKIT
-- (void)setRunLoopMode:(NSString *)runLoopMode
+- (void)setRunLoopMode:(NSRunLoopMode)runLoopMode
 {
-    if (![@[NSDefaultRunLoopMode, NSRunLoopCommonModes] containsObject:runLoopMode]) {
-        NSAssert(NO, @"Invalid run loop mode: %@", runLoopMode);
-        _runLoopMode = [[self class] defaultRunLoopMode];
-    } else {
-        _runLoopMode = runLoopMode;
+    if ([_runLoopMode isEqualToString:runLoopMode]) {
+        return;
     }
+    if (_displayLink) {
+        if (_runLoopMode) {
+            [_displayLink removeFromRunLoop:[NSRunLoop mainRunLoop] forMode:_runLoopMode];
+        }
+        if (runLoopMode) {
+            [_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:runLoopMode];
+        }
+    }
+    _runLoopMode = [runLoopMode copy];
+}
+
+- (NSRunLoopMode)runLoopMode
+{
+    if (!_runLoopMode) {
+        _runLoopMode = [[self class] defaultRunLoopMode];
+    }
+    return _runLoopMode;
 }
 #endif
 
+- (BOOL)shouldIncrementalLoad {
+    if (!_initFinished) {
+        return YES; // Defaults to YES
+    }
+    return _initFinished;
+}
+
 #pragma mark - Private
 - (NSOperationQueue *)fetchQueue
 {
@@ -280,6 +295,13 @@ static NSUInteger SDDeviceFreeMemory() {
     return _frameBuffer;
 }
 
+- (dispatch_semaphore_t)lock {
+    if (!_lock) {
+        _lock = dispatch_semaphore_create(1);
+    }
+    return _lock;
+}
+
 #if SD_MAC
 - (CVDisplayLinkRef)displayLink
 {

Tests/Tests/SDAnimatedImageTest.m

@@ -156,7 +156,7 @@ static const NSUInteger kTestGIFFrameCount = 5; // local TestImage.gif loop coun
 #endif
 }
 
-- (void)test12AnimatedImageViewInitWithImage {
+- (void)test13AnimatedImageViewInitWithImage {
     // Test that -[SDAnimatedImageView initWithImage:] this convenience initializer not crash
     SDAnimatedImage *image = [SDAnimatedImage imageWithData:[self testAPNGPData]];
     SDAnimatedImageView *imageView;