支持业务层直接推送视频帧，支持屏幕共享推流

Example/SellyCloudSDK/VideoCall/SellyVideoCallConferenceController.m

@@ -12,6 +12,7 @@
 #import "UIView+SellyCloud.h"
 #import "SLSVideoGridView.h"
 #import "TokenGenerator.h"
+#import <ReplayKit/ReplayKit.h>         //屏幕采集
 
 @interface SellyVideoCallConferenceController ()<SellyRTCSessionDelegate>
 
@@ -23,7 +24,7 @@
 
 @property (weak, nonatomic) IBOutlet SLSVideoGridView *grid;
 @property (weak, nonatomic) IBOutlet UILabel *duration;
-
+@property (nonatomic, strong)RPSystemBroadcastPickerView *systemBroadcastPicker;
 @end
 
 @implementation SellyVideoCallConferenceController
@@ -60,6 +61,29 @@
     //显示本地view
     [self attachLocalStream];
     self.localAudioEnable = true;
+    
+    [self addBroadcastButton];
+    
+}
+
+- (void)addBroadcastButton {
+    if (@available(iOS 12.0, *)) {
+        self.systemBroadcastPicker = [[RPSystemBroadcastPickerView alloc]
+            initWithFrame:CGRectMake(UIScreen.mainScreen.bounds.size.width-80, UIScreen.mainScreen.bounds.size.height-180, 60, 60)];
+        
+        NSString *bundleId = [NSBundle mainBundle].bundleIdentifier;
+        self.systemBroadcastPicker.preferredExtension = [NSString stringWithFormat:@"%@.ScreenShareUploader",bundleId];// 你的 extension bundle id
+        self.systemBroadcastPicker.showsMicrophoneButton = false;
+    }
+}
+
+- (IBAction)startScreenCapture:(id)sender {
+    for (UIView *view in self.systemBroadcastPicker.subviews) {
+        if ([view isKindOfClass:[UIButton class]]) {
+            [((UIButton *)view) sendActionsForControlEvents:(UIControlEventAllEvents)];
+            break;
+        }
+    }
 }
 
 - (void)viewDidDisappear:(BOOL)animated {
@@ -187,6 +211,17 @@
     [session renewToken:newToken];
 }
 
+- (void)rtcSession:(SellyRTCSession *)session onScreenShareStatusChanged:(SellyScreenShareState)state {
+    if (state == SellyScreenShareStateStarted) {
+        self.localVideoEnable = false;
+        [self.session startScreenCapture];
+    }
+    else if (state == SellyScreenShareStateStopped) {
+        self.localVideoEnable = true;
+        [self.session enableLocalVideo:true];
+    }
+}
+
 - (SellyRTCSession *)session {
     if (!_session) {
         _session = [[SellyRTCSession alloc] initWithType:false];