Constraints-helper 0.0.1

Constraints-helper 0.0.1

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语言语言 Obj-CObjective C
许可证 WTFPL
发布上次发布2014年12月

由Simon Westerlund维护。

Constraints-helper 0.0.1

反复写相同的属性让我感到疲倦，所以我写了一个小类别来帮助我。

使用方法

以下三行代码

[someView addConstraint:[NSLayoutConstraint wes_constraintWithItem:anotherView
                                                         attribute:NSLayoutAttributeWidth
                                                            toItem:someView]];

等同于

[someView addConstraint:[NSLayoutConstraint constraintWithItem:anotherView
                                                     attribute:NSLayoutAttributeWidth
                                                     relatedBy:NSLayoutRelationEqual
                                                        toItem:someView
                                                     attribute:NSLayoutAttributeWidth
                                                    multiplier:1.0f
                                                      constant:0.0f]];

您可以看到，有很多重复的值。谢谢了。

您甚至可以这样做

[someView addConstraints:[NSLayoutConstraint wes_constraintWithItem:anotherView
                                                         size:CGSizeMake(100, 50)]];

这相当于

[someView addConstraint:[NSLayoutConstraint constraintWithItem:anotherView
                                                     attribute:NSLayoutAttributeWidth
                                                     relatedBy:NSLayoutRelationEqual
                                                        toItem:nil
                                                     attribute:NSLayoutAttributeNotAnAttribute
                                                    multiplier:1.0f
                                                      constant:100.0f]];

[someView addConstraint:[NSLayoutConstraint constraintWithItem:anotherView
                                                     attribute:NSLayoutAttributeHeight
                                                     relatedBy:NSLayoutRelationEqual
                                                        toItem:nil
                                                     attribute:NSLayoutAttributeNotAnAttribute
                                                    multiplier:1.0f
                                                      constant:50.0f]];

挺不错的，对吧？

如您所见，我只去掉了常用且常留空的一些属性和属性。

还有其他什么？

嗯，这里列出所有可用的助手

/// Returns an array of constraints to set up a view's size
+ (NSArray *)wes_constraintWithItem:(id)view1 size:(CGSize)size;

/// Returns a constraint with two views that will use have the same relation with that specific attribute
+ (instancetype)wes_constraintWithItem:(id)view1 attribute:(NSLayoutAttribute)attr1 toItem:(id)view2;

/// Returns a constraint with two views that will use have the same relation with that specific attribute, however you can now set the constant
+ (instancetype)wes_constraintWithItem:(id)view1 attribute:(NSLayoutAttribute)attr1 toItem:(id)view2 constant:(CGFloat)c;

/// Returns a constraint with two views that will use the equal relation, however, you're free to set two different attributes and a constant
+ (instancetype)wes_constraintWithItem:(id)view1 attribute:(NSLayoutAttribute)attr1 toItem:(id)view2 attribute:(NSLayoutAttribute)attr2 constant:(CGFloat)c;

您可以在twitter上找到我，@wesslansimon。