- (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];
// 打印所有子视图
[self getSub:self.view andLevel:1];
}
// 递归获取子视图
- (void)getSub:(UIView *)view andLevel:(int)level {
NSArray *subviews = [view subviews];
// 如果没有子视图就直接返回
if ([subviews count] == 0) return;
for (UIView *subview in subviews) {
// 根据层级决定前面空格个数，来缩进显示
NSString *blank = @"";
for (int i = 1; i < level; i++) {
blank = [NSString stringWithFormat:@" %@", blank];
}
// 打印子视图类名
NSLog(@"%@%d: %@", blank, level, subview.class);
// 递归获取此视图的子视图
[self getSub:subview andLevel:(level+1)];
}
}
打印结果
image.png
