使用递归：

- (void)listSubviewsOfView:(UIView *)view {

    // Get the subviews of the view
    NSArray *subviews = [view subviews];

    // Return if there are no subviews
    if ([subviews count] == 0) return; // COUNT CHECK LINE

    for (UIView *subview in subviews) {

        // Do what you want to do with the subview
        NSLog(@"%@", subview);

        // List the subviews of subview
        [self listSubviewsOfView:subview];
    }
}

方法转载自：http://stackoverflow.com/a/7244069/3458781

打印结果：

2014-10-10 16:05:14.191 MyAPP[1951:60b] <UIView: 0x16d61a90; frame = (0 64; 320 31); autoresize = RM+BM; layer = <CALayer: 0x16ddb850>>
2014-10-10 16:05:14.192 Vinyo[1951:60b] <UILabel: 0x16d1aa60; frame = (15 70; 210 20); text = 'Choose a credit card'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x16d1c7f0>>