iOS - Looping through subviews - ios

Question

I am trying to loop all my subviews and print them in NSLog.
I have developed this recursive method:
- (void)allSubViews:(UIView*)mainV
{
for (UIView *view in mainV.subviews) {
NSLog(#"%#", view);
if ([[view subviews]count]>0) {
[self allSubViews:view];
}
}
}
which I call from MainViewController.m:
[self allSubViews:self.myView];
The result is:
2015-09-12 11:18:48.919 Profile-Statistics[3153:506562] <_UILayoutGuide: 0x7fc70bf1c330; frame = (0 0; 0 0); hidden = YES;
layer = >
2015-09-12 11:18:48.919 Profile-Statistics[3153:506562] <_UILayoutGuide: 0x7fc70bf1ced0; frame = (0 0; 0 0); hidden = YES;
layer = >
My View has Top and Bottom Layout Guide and a View which has 3 UIButtons, 1 ImageView and 1 UIView.
Did I miss something here?
Update:
Screenshot of StoryBoard

Answer 1

For what it's worth, I tried this in a sample project with a bunch of subviews and it worked as expected.
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (IBAction)printButtonTapped:(id)sender {
[self allSubviews:self.view];
}
- (void) allSubviews:(UIView*) parent {
NSLog(#"%#", parent);
for (UIView *child in parent.subviews) {
[self allSubviews:child];
}
}
#end
Console output is:
2015-09-13 22:06:00.904 RecursivePrint[66243:3455899] <UIView: 0x7fa902e0e6e0; frame = (0 0; 375 667); autoresize = W+H; layer = <CALayer: 0x7fa902e15030>>
2015-09-13 22:06:00.905 RecursivePrint[66243:3455899] <UIView: 0x7fa902e0e840; frame = (70 56; 452 337); autoresize = RM+BM; layer = <CALayer: 0x7fa902e15050>>
2015-09-13 22:06:00.905 RecursivePrint[66243:3455899] <UIView: 0x7fa902e24c90; frame = (31 33; 153 160); autoresize = RM+BM; layer = <CALayer: 0x7fa902e21f00>>
2015-09-13 22:06:00.906 RecursivePrint[66243:3455899] <UIView: 0x7fa902e24fc0; frame = (219 41; 153 160); autoresize = RM+BM; layer = <CALayer: 0x7fa902e1ec10>>
2015-09-13 22:06:00.906 RecursivePrint[66243:3455899] <UIButton: 0x7fa902d177e0; frame = (164.5 603; 46 30); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x7fa902d16c80>>
2015-09-13 22:06:00.907 RecursivePrint[66243:3455899] <UIButtonLabel: 0x7fa902d1f010; frame = (0 6; 46 18); text = 'Button'; alpha = 0.2; opaque = NO; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7fa902d1f670>>
2015-09-13 22:06:00.907 RecursivePrint[66243:3455899] <_UILayoutGuide: 0x7fa902e25ed0; frame = (0 0; 0 20); hidden = YES; layer = <CALayer: 0x7fa902e21b20>>
2015-09-13 22:06:00.907 RecursivePrint[66243:3455899] <_UILayoutGuide: 0x7fa902f77ec0; frame = (0 667; 0 0); hidden = YES; layer = <CALayer: 0x7fa902f09f70>>
As a side note, this is the first time in over a year that I've tried to do something in Objective-C. The Swift version seems so much easier to understand:
import UIKit
class ViewController: UIViewController {
#IBAction func printButtonTapped(sender: UIButton) {
printSubviews(self.view)
}
}
func printSubviews(parent:UIView) {
print(parent)
for child in parent.subviews {
printSubviews(child)
}
}
In addition, the Swift version of printSubviews is defined as a function, not a method so you don't call it from self, you just call it with the top level view you want to start with.