ios - swift 2.1 无法将 anyobject 类型的值转换为预期的参数类型 nslayoutconstraint

Question

现在我正在使用 swift 2.1 但我已经在 swift 2.0 上创建了我的项目，我的代码正在 swift 2.0 上工作但是当我尝试在最新的 swift 中进行代码转换时我无法理解如何转换请给我解决方案

   var header_constraint_H_Format = ""
            var header_constraint_V_Format = ""
            var bubble_constraint_H_Format = ""
            var bubble_constraint_V_Format = ""
            var content_constraint_H_Format = ""
            var content_constraint_V_Format = ""


            if message?.role == Role.Sender {
                header_constraint_H_Format =  "[header(50)]-5-|"
                header_constraint_V_Format =  "V:|-5-[header(50)]"
                bubble_constraint_H_Format  =  "|-(>=5)-[bubble]-10-[header]"
                bubble_constraint_V_Format  =  "V:|-5-[bubble(>=50)]-5-|"
                content_constraint_H_Format  =  "|-(>=5)-[content]-25-|"
                content_constraint_V_Format  =  "V:|[content]-5-|"
            } else {
                header_constraint_H_Format =  "|-5-[header(50)]"
                header_constraint_V_Format =  "V:|-5-[header(50)]"
                bubble_constraint_H_Format  =  "[header]-10-[bubble]-(>=5)-|"
                bubble_constraint_V_Format  =  "V:|-5-[bubble(>=50)]-5-|"
                content_constraint_H_Format  =  "|-25-[content]-(>=5)-|"
                content_constraint_V_Format  =  "V:|[content]-5-|"
            }


            let header_constraint_H:NSArray = NSLayoutConstraint.constraintsWithVisualFormat(header_constraint_H_Format, options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewsDictionary)
            let header_constraint_V:NSArray = NSLayoutConstraint.constraintsWithVisualFormat(header_constraint_V_Format, options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewsDictionary)

            let bubble_constraint_H:NSArray = NSLayoutConstraint.constraintsWithVisualFormat(bubble_constraint_H_Format, options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewsDictionary)
            let bubble_constraint_V:NSArray = NSLayoutConstraint.constraintsWithVisualFormat(bubble_constraint_V_Format, options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewsDictionary)

            let content_constraint_H:NSArray = NSLayoutConstraint.constraintsWithVisualFormat(content_constraint_H_Format, options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewsDictionary)
            let content_constraint_V:NSArray = NSLayoutConstraint.constraintsWithVisualFormat(content_constraint_V_Format, options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewsDictionary)

            self.contentView.addConstraints(header_constraint_H as [AnyObject])
            self.contentView.addConstraints(header_constraint_V as [AnyObject])
            self.contentView.addConstraints(bubble_constraint_H as [AnyObject])
            self.contentView.addConstraints(bubble_constraint_V as [AnyObject])
            self.bubbleImgView.addConstraints(content_constraint_H as [AnyObject])
            self.bubbleImgView.addConstraints(content_constraint_V as [AnyObject]) 

Answer 1

UIView 方法 .addConstraints 接受类型 NSLayoutConstraint，而不是类型 AnyObject

UIView Class Reference:
func addConstraint(constraint: NSLayoutConstraint)

由于您在调用 .addConstraints(...) 时将 NSLayoutConstraint 属性转换为 AnyObject，因此您尝试调用后者使用无效的参数类型。

尝试在对 .addConstraints(...) 的调用中删除 as [AnyObject]。