- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = UIColor.whiteColor;
    
    UILabel *label = [UILabel new];
    UIButton *button = [UIButton new];
    
    UIImageView *imageView = [UIImageView new];
    UIView *view1 = [UIView new];
    UIView *view2 = [UIView new];
    
    [self.view addSubview:label];
    [self.view addSubview:button];
    [button addSubview:imageView];
    [imageView addSubview:view1];
    [imageView addSubview:view2];
    
    // 打印所有子視圖
 [self getSub:self.view andLevel:1];
    
}

// 遞歸獲取子視圖
- (void)getSub:(UIView *)view andLevel:(int)level {
    NSArray *subviews = [view subviews];
    
    // 如果沒(méi)有子視圖就直接返回
    if ([subviews count] == 0) return;
    
    for (UIView *subview in subviews) {
        
        // 根據(jù)層級(jí)決定前面空格個(gè)數(shù)，來(lái)縮進(jìn)顯示
        NSString *blank = @"";
        for (int i = 1; i < level; i++) {
            blank = [NSString stringWithFormat:@"  %@", blank];
        }
        
        // 打印子視圖類名
        NSLog(@"%@%d: %@", blank, level, subview.class);
        
        // 遞歸獲取此視圖的子視圖
        [self getSub:subview andLevel:(level+1)];
        
    }
}

打印結(jié)果

image.png

參考：https://blog.csdn.net/Cloudox_/article/details/64132566