iOS 懒人日记之UIView对齐方法扩充

想要快速布局，又不想用第三方布局的同胞们可以自己写快速布局的方法。之前为了布局简单对UIView进行了一些扩展，很多人都用到过，在UIView类别中我们可以设置UIView x,y,width,height声明，自己实现设置获取的方法，用着确实方便了许多。在看之前代码时发现在设置单个frame的一般属性这种方法着实方便，但是当相对于其他view进行设置对齐就略显薄弱。

为了偷懒，还要看着简洁，就想着自己写一下方法，这次时间有限，写了几个简单常用的方法，maxX获取view最大X值，maxY获取view最大Y值，centerxEqualToView设置于目标view的centerx对齐，centeryEqualToView设置于目标view的centery对齐等方法。

UIView类目git地址： https://github.com/MisterZhouZhou/ZWUIViewExtension

对齐原理很简单就是利用block传值。

version1:

这种对齐方式只能解决非子父关系的view布局要求

在UIView类目.h中声明属性

/** x + width */ @property(nonatomic,assign) CGFloat maxX; /** y + height */ @property(nonatomic,assign) CGFloat maxY; /** centerX equal to View‘s centerX * centerxEqualToView(superview/view) */ -(void(^)(UIView *view))centerxEqualToView; /** centerY equal to View‘s centerY * centeryEqualToView(superview/view) */ -(void(^)(UIView *view))centeryEqualToView; /** center equal to View‘s center * centerEqualToView(superview/view) */ -(void(^)(UIView *view))centerEqualToView; /** left equal to View‘s left * leftEqualToView(superview/view) */ -(void(^)(UIView *view))leftEqualToView; /** right equal to View‘s right * rightEqualToView(superview/view) */ -(void(^)(UIView *view))rightEqualToView; /** top equal to View‘s top * topEqualToView(superview/view) */ -(void(^)(UIView *view))topEqualToView; /** bottom equal to View‘s bottom * bottomEqualToView(superview/view) */ -(void(^)(UIView *view))bottomEqualToView;

在UIView类目.m中简单实现：

-(CGFloat)maxX { return self.frame.origin.x + self.frame.size.width; } -(CGFloat)maxY { return self.frame.origin.y + self.frame.size.height; } #pragma mark - equalToView -(void(^)(UIView *view))centerxEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); CGFloat centerx = view.center.x; self.center = CGPointMake(centerx, self.center.y); }; } -(void(^)(UIView *view))centeryEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); self.center = CGPointMake(self.center.x, view.center.y); }; } -(void(^)(UIView *view))centerEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); self.center = view.center; }; } -(void(^)(UIView *view))leftEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); self.x = view.x; }; } -(void(^)(UIView *view))rightEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); self.maxX = view.maxX; }; } -(void(^)(UIView *view))topEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); self.y = view.y; }; } -(void(^)(UIView *view))bottomEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); self.maxY = view.maxY; }; }

偷懒后，就可以这样调用了。

loginBgView.y = loginView.maxY = 10; loginBgView.centerxEqualToView(loginView); //loginBgView.centeryEqualToView(loginView); //loginBgView.centerEqualToView(loginView);

version2:

兼容含子父关系的view布局要求，布局需要先添加view再进行布局

于是做了以下变动

#pragma mark - equalToView -(void(^)(UIView *view))centerxEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); //如果是子父关系 if ([self.superview isKindOfClass:[view class]]) { self.center = CGPointMake(view.center.x - view.x, self.center.y); }else{ self.center = CGPointMake(view.center.x, self.center.y); } }; } -(void(^)(UIView *view))centeryEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); //如果是子父关系 if ([self.superview isKindOfClass:[view class]]) { self.center = CGPointMake(self.center.x, view.center.y - view.y); }else{ self.center = CGPointMake(self.center.x, view.center.y); } }; } -(void(^)(UIView *view))centerEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); //如果是子父关系 if ([self.superview isKindOfClass:[view class]]) { self.center = CGPointMake(view.center.x - view.x , view.center.y - view.y); } else{ self.center = view.center; } }; } -(void(^)(UIView *view))leftEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); //如果是子父关系 if ([self.superview isKindOfClass:[view class]]) { self.center = CGPointMake(view.center.x - view.x,self.center.y); self.x = self.centerX - view.width/2; }else{ self.x = view.x; } }; } -(void(^)(UIView *view))rightEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); //如果是子父关系 if ([self.superview isKindOfClass:[view class]]) { self.center = CGPointMake(view.center.x - view.x,self.center.y); self.maxX = self.centerX + view.width/2; }else{ self.maxX = view.maxX; } }; } -(void(^)(UIView *view))topEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); //如果是子父关系 if ([self.superview isKindOfClass:[view class]]) { self.center = CGPointMake(self.center.x,view.center.y - view.y); self.y = self.centerY - view.height/2; }else{ self.y = view.y; } }; } -(void(^)(UIView *view))bottomEqualToView{ @WeakObj(self); return ^(UIView *view){ @StrongObj(self); //如果是子父关系 if ([self.superview isKindOfClass:[view class]]) { self.center = CGPointMake(self.center.x,view.center.y - view.y); self.maxY = self.centerY + view.height/2; }else{ self.maxY = view.maxY; } }; }