ios之VFL的补充(二)

[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[languageImage(15)]"
                                                                             options:0
                                                                             metrics:nil
                                                                               views:viewsDictionary]];

[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[forkImage(==languageImage)]"
                                                                             options:0
                                                                             metrics:nil
                                                                               views:viewsDictionary]];

表明 forkImage的高度与 languageImage的高度一样。