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Example/SellyCloudSDK/VideoCall/SLSVideoGridView.m

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+//
+//  SLSVideoGridView.m
+//  SellyCloudSDK_Example
+//
+//  Created by Caleb on 13/11/25.
+//  Copyright © 2025 Caleb. All rights reserved.
+//
+
+#import "SLSVideoGridView.h"
+
+@interface SLSVideoGridView ()
+@property (nonatomic, strong) NSMutableDictionary<NSString*, SLSParticipant*>   *participants;
+@property (nonatomic, strong) NSMutableDictionary<NSString*, SLSVideoTileView*> *tiles;
+@end
+
+@implementation SLSVideoGridView
+
+// 代码创建时走这里
+- (instancetype)initWithFrame:(CGRect)frame {
+    if (self = [super initWithFrame:frame]) {
+        [self commonInit];
+    }
+    return self;
+}
+
+// xib / storyboard 反序列化时走这里
+- (instancetype)initWithCoder:(NSCoder *)coder {
+    if (self = [super initWithCoder:coder]) {
+        [self commonInit];
+    }
+    return self;
+}
+
+// 公共初始化逻辑
+- (void)commonInit {
+    _participants = [NSMutableDictionary dictionary];
+    _tiles        = [NSMutableDictionary dictionary];
+    _spacing      = 8.f;
+    _padding      = UIEdgeInsetsMake(8, 8, 8, 8);
+    _keepAspect169 = YES;
+
+    self.backgroundColor = [UIColor blackColor];
+}
+
+#pragma mark - Public
+
+- (SLSVideoTileView *)ensureRenderContainerForUID:(NSString *)uid
+                            displayName:(nullable NSString *)name {
+    if (!uid) return nil;
+
+    SLSParticipant *p = self.participants[uid];
+    if (!p) {
+        p = [SLSParticipant new];
+        p.uid = uid;
+        p.displayName = name ?: uid;
+        p.lastActiveAt = [NSDate date];
+        self.participants[uid] = p;
+    }
+
+    SLSVideoTileView *tile = self.tiles[uid];
+    if (!tile) {
+        tile = [[SLSVideoTileView alloc] initWithFrame:CGRectZero];
+        self.tiles[uid] = tile;
+        [self addSubview:tile];
+    }
+
+    [tile updateWithParticipant:p];
+    [self _layout];
+
+    return tile;
+}
+
+- (void)detachUID:(NSString *)uid {
+    if (!uid) return;
+    SLSVideoTileView *tile = self.tiles[uid];
+    if (tile) {
+        [tile removeFromSuperview];
+        [self.tiles removeObjectForKey:uid];
+    }
+    [self.participants removeObjectForKey:uid];
+    [self _layout];
+}
+
+- (void)setLevel:(CGFloat)level forUID:(NSString *)uid {
+    SLSParticipant *p = self.participants[uid];
+    if (!p) return;
+    p.level = MAX(0.f, MIN(level, 1.f));
+    if (p.level > 0.1) {
+        p.lastActiveAt = [NSDate date];
+    }
+    SLSVideoTileView *tile = self.tiles[uid];
+    [tile updateWithParticipant:p];
+}
+
+- (void)setAudioMuted:(BOOL)muted forUID:(NSString *)uid {
+    SLSParticipant *p = self.participants[uid];
+    if (!p) return;
+    p.audioMuted = muted;
+    SLSVideoTileView *tile = self.tiles[uid];
+    [tile updateWithParticipant:p];
+}
+
+- (void)setVideoMuted:(BOOL)muted forUID:(NSString *)uid {
+    SLSParticipant *p = self.participants[uid];
+    if (!p) return;
+    p.videoMuted = muted;
+    SLSVideoTileView *tile = self.tiles[uid];
+    [tile updateWithParticipant:p];
+}
+
+#pragma mark - Layout
+
+- (void)_layout {
+    NSArray<NSString *> *uids = self.participants.allKeys;
+    NSInteger n = uids.count;
+    if (n == 0) return;
+
+    UIEdgeInsets p = self.padding;
+    CGFloat W = self.bounds.size.width  - p.left - p.right;
+    CGFloat H = self.bounds.size.height - p.top  - p.bottom;
+    CGFloat s = self.spacing;
+
+    // ===== 按人数选择固定的行列数 =====
+    NSInteger cols = 1;
+    NSInteger rows = 1;
+
+    if (n <= 4) {
+        cols = 2;
+        rows = 2;
+    } else if (n <= 9) {
+        cols = 3;
+        rows = 3;
+    } else if (n <= 16) {
+        cols = 4;
+        rows = 4;
+    } else {
+        // >16 的情况先简单处理：依旧按 4x4 布局，多出来的不显示
+        cols = 4;
+        rows = 4;
+    }
+
+    // 每个 cell 的宽 / 高（都按“可用区域的 1/2、1/3、1/4”来，扣掉间距）
+    CGFloat cellW = 0;
+    CGFloat cellH = 0;
+    if (cols > 0) {
+        cellW = floor((W - s * (cols - 1)) / cols);
+    }
+    if (rows > 0) {
+        cellH = floor((H - s * (rows - 1)) / rows);
+    }
+
+    NSInteger maxCells = cols * rows;
+    NSInteger countToLayout = MIN(n, maxCells);
+
+    [uids enumerateObjectsUsingBlock:^(NSString *uid, NSUInteger idx, BOOL *stop) {
+        if (idx >= countToLayout) {
+            *stop = YES;
+            return;
+        }
+
+        NSInteger r = idx / cols; // 第几行
+        NSInteger c = idx % cols; // 第几列
+
+        CGFloat x = p.left + c * (cellW + s);
+        CGFloat y = p.top  + r * (cellH + s);
+
+        SLSVideoTileView *tile = self.tiles[uid];
+        tile.frame = CGRectMake(x, y, cellW, cellH);
+
+        SLSParticipant *part = self.participants[uid];
+        [tile updateWithParticipant:part];
+    }];
+}
+
+- (void)layoutSubviews {
+    [super layoutSubviews];
+    [self _layout];
+}
+
+@end