iOS递归打印UIView的结构

+ (NSString *)showViewHierarchy:(UIView *)view level:(NSInteger)level
{
NSMutableString * description = [NSMutableString string];
NSMutableString * indent = [NSMutableString string];
for (NSInteger i = 0; i < level; i++)
{
[indent appendString:@"  |"];
}

[description appendFormat:@"\n%@%@", indent, [view description]];
for (UIView * item in view.subviews)
{
[description appendFormat:@"%@", [UIView showViewHierarchy:item level:level + 1]];
}
return [description copy];
}

//
// 实现view的循环打印
- (NSString *)recursiveDiscription
{
return [UIView showViewHierarchy:self level:0];
}