Autolayout bug with NSLayoutAttributeBaseLine

gistfile1.txt

//
//  ALEViewController.m
//  FLKAutoLayoutExample
//
//  Created by Rafa on 2014/05/21.
//

#import "ALEViewController.h"
#import "UIView+FLKAutoLayout.h"

@interface ALEViewController ()

@end

@implementation ALEViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self buildLayoutWithNSLayoutConstraints];
}

- (void)buildLayoutWithFLKAutoLayout
{
    NSMutableArray* labels = [NSMutableArray array];
    for (NSUInteger i = 0; i < 3; i++) {
        UILabel* label = [[UILabel alloc] init];
        label.translatesAutoresizingMaskIntoConstraints = NO;
        label.backgroundColor = [UIColor whiteColor];
        label.text = [NSString stringWithFormat:@"Label %d", i];
        [self.view addSubview:label];
        [labels addObject:label];
    }
     [labels[0] alignTopEdgeWithView:self.view predicate:@"40"];
     [labels[0] constrainWidthToView:self.view predicate:@"*.5-20"];
     [labels[0] alignLeadingEdgeWithView:self.view predicate:@"20"];
     [UIView alignLeadingAndTrailingEdgesOfViews:labels];
     [UIView spaceOutViewsVertically:labels predicate:@"20"];
    
    NSMutableArray* textFields = [NSMutableArray array];
    for (NSUInteger i = 0; i < labels.count; i++) {
        UITextField* textField = [[UITextField alloc] init];
        textField.translatesAutoresizingMaskIntoConstraints = NO;
        textField.borderStyle = UITextBorderStyleRoundedRect;
        textField.text = [NSString stringWithFormat:@"text field %d", i];
        [self.view addSubview:textField];
        [textFields addObject:textField];
    }
     [textFields[0] constrainLeadingSpaceToView:labels[0] predicate:@"20"];
     [textFields[0] alignTrailingEdgeWithView:self.view predicate:@"-10"];
     [UIView alignLeadingAndTrailingEdgesOfViews:textFields];
     [UIView alignAttribute:NSLayoutAttributeBaseline ofViews:textFields toViews:labels predicate:nil];
    
    NSLog(@"%s %@",__PRETTY_FUNCTION__,[self.view constraints]);
}

- (void)buildLayoutWithNSLayoutConstraints
{
    UIView *previous = nil;
    NSMutableArray* labels = [NSMutableArray array];
    for (NSUInteger i = 0; i < 3; i++) {
        UILabel* label = [[UILabel alloc] init];
        label.translatesAutoresizingMaskIntoConstraints = NO;
        label.backgroundColor = [UIColor whiteColor];
        label.text = [NSString stringWithFormat:@"Label %d", i];
        [self.view addSubview:label];
        [labels addObject:label];
        
        if (!previous) {
            [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(40)-[label]"
                                                                              options:kNilOptions
                                                                              metrics:nil
                                                                                views:NSDictionaryOfVariableBindings(label)]];
        } else {
            [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[previous]-(20)-[label]"
                                                                              options:kNilOptions
                                                                              metrics:nil
                                                                                views:NSDictionaryOfVariableBindings(label, previous)]];
        }
        previous = label;
        
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(20)-[label]"
                                                                          options:kNilOptions
                                                                          metrics:nil
                                                                            views:NSDictionaryOfVariableBindings(label)]];
        [self.view addConstraint:[NSLayoutConstraint constraintWithItem:label
                                                              attribute:NSLayoutAttributeWidth
                                                              relatedBy:NSLayoutRelationEqual
                                                                 toItem:self.view
                                                              attribute:NSLayoutAttributeWidth
                                                             multiplier:0.5
                                                               constant:-20]];
    }
    
    NSMutableArray* textFields = [NSMutableArray array];
    for (NSUInteger i = 0; i < labels.count; i++) {
        UITextField* textField = [[UITextField alloc] init];
        textField.translatesAutoresizingMaskIntoConstraints = NO;
        textField.borderStyle = UITextBorderStyleRoundedRect;
        textField.text = [NSString stringWithFormat:@"text field %d", i];
        [self.view addSubview:textField];
        [textFields addObject:textField];
        
        UIView *label = labels[i];
        
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[label]-(20)-[textField]-(10)-|"
                                                                          options:kNilOptions
                                                                          metrics:nil
                                                                            views:NSDictionaryOfVariableBindings(label,textField)]];
        [self.view addConstraint:[NSLayoutConstraint constraintWithItem:textField
                                                              attribute:NSLayoutAttributeBaseline
                                                              relatedBy:NSLayoutRelationEqual
                                                                 toItem:label
                                                              attribute:NSLayoutAttributeBaseline
                                                             multiplier:1
                                                               constant:0]];
    }
    
    NSLog(@"%s %@",__PRETTY_FUNCTION__,[self.view constraints]);
}

@end