获取view的subview的层级关系

// 递归方法获取子视图
- (void)getSubview:(UIView *)view level:(int)level {
    
    NSArray *subviews = [view subviews];
    if ([subviews count] == 0) return;
    
    for (UIView *subview in subviews) {
        NSString *blank = @"";
        for (int i = 1; i < level; i++) {
            blank = [NSString stringWithFormat:@"  %@", blank];
        }
        NSLog(@"====%@%d: %@", blank, level, subview.class);
        [self getSubview:subview level:(level + 1)];
    }
}

调用：

[self getSubview:self.navigationController.navigationBar level:1];

打印结果：

导航栏子视图