标签:方法 asa div null res 地方 scons read 写法
Masonry在oc下使用很方便,但是在swift下,由于oc方法和property都可以使用.fuc的语法,swift下只有属性可以使用.property的语法,方法只能写成.func().因此在swift下如果直接写就只能写成
downTriangle.mas_makeConstraints { (make: MASConstraintMaker? ) in _ = make?.left.equalTo()(self) _ = make?.bottom.equalTo()(self) }
skillTypeText.mas_makeConstraints { _ = $0?.top.left.equalTo()(self.containerView)?.with().offset()(0) let size = NSValue(cgSize: CGSize(width:30, height:15)) _ = $0?.size.equalTo()(size) }
这种写法非常麻烦,也不自然。如果直接使用snapkit又需要引入新的库,所以楼主就对masonry做了些改动。改动后的写法:
downTriangle.mas_makeConstraints { $0.left.sEqualTo(self) $0.bottom.sEqualTo(self) }
对于mas_equalTo则可以写成:
skillTypeText.mas_makeConstraints { $0.top.left.sEqualTo(self.containerView).with().sOffset(0) // let size = NSValue(cgSize: CGSize(width:30, height:15)) $0.size.sEqualTo(size: CGSize(width:30, height:15)) }
主要改动了以下几个地方:
1.mas_makeConstraints 及类似方法添加__nonnull的声明
- (NSArray *)mas_makeConstraints:( void(^ _Nonnull )(MASConstraintMaker* __nonnull make))block;
2.Masconstraint添加属性声明,本来是想写个category添加个声明,但是失败了,好像只能写在原文件上。
@property (nonatomic, strong, readonly) MASConstraint *left; @property (nonatomic, strong, readonly) MASConstraint *top; @property (nonatomic, strong, readonly) MASConstraint *right; @property (nonatomic, strong, readonly) MASConstraint *bottom; @property (nonatomic, strong, readonly) MASConstraint *leading; @property (nonatomic, strong, readonly) MASConstraint *trailing; @property (nonatomic, strong, readonly) MASConstraint *width; @property (nonatomic, strong, readonly) MASConstraint *height; @property (nonatomic, strong, readonly) MASConstraint *centerX; @property (nonatomic, strong, readonly) MASConstraint *centerY; @property (nonatomic, strong, readonly) MASConstraint *baseline;
3.swift下添加sEqualTo,sInset等方法
extension MASConstraint{ @discardableResult func sEqualTo(_ attr : Any?) -> MASConstraint!{ return self.equalTo()(attr) } @discardableResult func sEqualTo( point : CGPoint) -> MASConstraint!{ let value = NSValue(cgPoint:point) return self.equalTo()(value) } @discardableResult func sEqualTo( size : CGSize) -> MASConstraint!{ let value = NSValue(cgSize:size) return self.equalTo()(value) } @discardableResult func sEqualTo( inset : UIEdgeInsets) -> MASConstraint!{ let value = NSValue(uiEdgeInsets:inset) return self.equalTo()(value) } @discardableResult func sOffset(_ offset : CGFloat) -> MASConstraint!{ return self.offset()(offset) } @discardableResult func sInset(_ inset : UIEdgeInsets) -> MASConstraint!{ return self.insets()(inset) } }
masonry使用的各类方法有很多,楼主的项目也很赶,一般也是遇到一个写一个。大致改法都类似。像nsarray+masaddition基本没用,也没必要去添加。
标签:方法 asa div null res 地方 scons read 写法
原文地址:http://www.cnblogs.com/tiantianbobo/p/7076590.html