Masonry三方下载
本文参考:
地址1
地址2
地址3
地址4
*Masonry有哪些属性
@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;Masonry
(NSArray )mas_makeConstraints:(void(^)(MASConstraintMaker ))block;
(NSArray )mas_updateConstraints:(void(^)(MASConstraintMaker ))block;
(NSArray )mas_remakeConstraints:(void(^)(MASConstraintMaker make))block;
/** * mas_makeConstraints 只负责添加约束 AutoLayout不能同时存在两条针对同一对象的约束否则会报错 * mas_updateConstraints 针对上面的情况 会更新在block中出现的约束 不会导致出现两个相同约束的情况 * mas_remakeConstraints 清除之前所有的约束只保留新的约束 * * 三种函数要配合使用 */
重点:
使用mas_makeConstrains方法的元素必须事先添加到父视图中
mas_equalTo和equalTo区别:前者比后者多了类型转换操作,支持CGSize CGPoint NSNumber UIEdgeinsets。mas_equalTo是equalTo的封装,equalTo适用于基本数据类型,而mas_equaalTo适用于类似UIEdgeInsetsMake 等复杂类型,基本上它可以替换equalTo。
上左为正 下右为负 是因为坐标而来的 视图坐标左上为原点 X向右为正 Y向下为正
举例比较:
Make.left.equalTo(@64)
可以这么写才可以 字面量make.left.mas_equalTo(64);
而mas_equalTo可以不用字面量
先试一下:一个View居中
// 防止block循环引用 __weak typeof (self)weakSelf = self; UIView *yellow = [UIView new]; yellow.backgroundColor = [UIColor yellowColor];// 切记添加到父视图中 [self.view addSubview:yellow]; [yellow showPlaceHolder]; /** * 设置约束 * 使用mas_MakeConstraints:添加约束 */ [yellow mas_makeConstraints:^(MASConstraintMaker *make) { // 1.make就是添加约束的控件 // make.left.equalTo 的意思是左侧和谁相同 .offset则是偏移量 上左[为正]下右[为负] make.top.equalTo(self.view.mas_top).offset(30);// 和父视图顶部间距30 make.left.equalTo(self.view.mas_left).offset(30);// 和父视图左边间距30 make.bottom.equalTo(self.view.mas_bottom).offset(-30);// 和父视图底部间距30 make.right.equalTo(self.view.mas_right).offset(-30);// 和父视图右边间距30 // 2. 2等价于1 edges边缘的意思 make.edges.equalTo(self.view).width.insets(UIEdgeInsetsMake(30, 30, 30, 30)); // 3. 还等价于 make.top.left.bottom.and.right.equalTo(self.view).width.insets(UIEdgeInsetsMake(30, 30, 30, 30)); // 4.此处给yellow一个size 且让其居中make.size.mas_equalTo(CGSizeMake(300, 300)); make.center.equalTo(self.view); }];
size还可以这么写两者也相同
make.size.mas_equalTo(self.view).offset(-20);make.size.equalTo(self.view).offset(-20);
居中:
make.centerX.equalTo(self.view.mas_centerX); make.centerY.equalTo(self.view.mas_centerY);
等同于:make.center.mas_equalTo(self.view);
两个view
例1
如图
如图
[green mas_makeConstraints:^(MASConstraintMaker *make) { make.size.mas_equalTo(CGSizeMake(200, 120));// green大小 make.top.mas_equalTo(green.superview).offset(100);// green顶部到它父视图的偏移量 make.bottom.mas_equalTo(yellow.mas_top).offset(-50);// 50如果为正就是green底部到yellow顶部距离为50 为负就是green下边到yellow上边为50 make.centerX.equalTo(green.superview.mas_centerX);// 中心点的X坐标和父视图中心点的X相同 说人话就是在中间 }]; [yellow mas_makeConstraints:^(MASConstraintMaker *make) { make.size.mas_equalTo(CGSizeMake(250, 30)); // 给个size make.centerX.equalTo(green.mas_centerX);// centerX和green一样 }];
make.size.equalTo(green);
两个view就相同大小
等同于
make.width.equalTo(green.mas_width);make.height.equalTo(green.mas_height);
例2:
两个view
[green mas_makeConstraints:^(MASConstraintMaker *make) { // 添加大小约束 make.size.mas_equalTo(CGSizeMake(100, 100)); // 添加左上边距约束 make.left.and.top.mas_equalTo(20); }]; [yellow mas_makeConstraints:^(MASConstraintMaker *make) { // 大小和上边距约束与green相同 make.size.and.top.equalTo(green); // 添加右边距约束 上左为正下右为负 make.right.mas_equalTo(-20); }];
这里的and和with都没有具体操作只是拿来增加程序可读性
例3:
例3
[green mas_makeConstraints:^(MASConstraintMaker *make) { // 左上约束20 右侧约束-20 make.left.and.top.mas_equalTo(20); // 右边约束为-20 make.right.mas_equalTo(-20); }]; [yellow mas_makeConstraints:^(MASConstraintMaker *make) { // 下右约束-20 make.bottom.and.right.mas_equalTo(-20); // 高度和green相同 make.height.equalTo(green); // 顶部到green底部距离为20 make.top.equalTo(green.mas_bottom).offset(20); // 左侧到视图中心的距离为20 make.left.equalTo(weakSelf.view.mas_centerX).offset(20); }];
make.right.equalTo(weakSelf.view).offset(-20);
等同于make.right.mas_equalTo(-20);
例4:
屏幕快照 2015-12-07 上午9.42.41.png
UIView *gray = [UIView new]; gray.backgroundColor = [UIColor grayColor]; [self.view addSubview:gray]; [gray showPlaceHolder]; [gray mas_makeConstraints:^(MASConstraintMaker *make) { // 左上下距离父视图都为0 make.left.and.top.and.bottom.mas_equalTo(0); // 宽度为200 make.width.mas_equalTo(200); }]; UIView *w = [UIView new]; w.backgroundColor = [UIColor colorWithWhite:0.228 alpha:1.000]; [w showPlaceHolder]; [self.view addSubview:w]; UIView *light = [UIView new]; light.backgroundColor = [UIColor lightGrayColor]; [light showPlaceHolder]; [self.view addSubview:light]; [w mas_makeConstraints:^(MASConstraintMaker *make) { // w底部距离父视图centerY的距离为10 make.bottom.equalTo(weakSelf.view.mas_centerY).mas_equalTo(-10); // 左侧距离gray距离为20 make.left.equalTo(gray).offset(20); // 右侧距离gray距离20 make.right.equalTo(gray).offset(-20); make.height.mas_equalTo(100); }]; [light mas_makeConstraints:^(MASConstraintMaker *make) { // 顶部距离父视图centerY为10 make.top.equalTo(weakSelf.view.mas_centerY).mas_equalTo(10); // 左右和高度与w相同 make.left.and.right.and.height.equalTo(w); }];
上下左右边距
make.top.left.bottom.right.equalTo(weakSelf.view).width.insets(UIEdgeInsetsMake(20, 20, 100, 20));
等价make.edges.equalTo(weakSelf.view).width.insets(UIEdgeInsetsMake(20, 20, 100, 20));
例5:
屏幕快照 2015-12-07 下午3.04.56.png
[green mas_makeConstraints:^(MASConstraintMaker *make) { make.centerY.mas_equalTo(weakSelf.view.mas_centerY); make.left.equalTo(weakSelf.view.mas_left).offset(10); make.right.equalTo(yellow.mas_left).offset(-10); make.height.mas_equalTo(150); make.width.equalTo(yellow); }]; [yellow mas_makeConstraints:^(MASConstraintMaker *make) { make.centerY.mas_equalTo(weakSelf.view.mas_centerY); make.left.equalTo(green.mas_right).offset(10); make.right.equalTo(weakSelf.view.mas_right).offset(-10); make.height.mas_equalTo(@150); make.width.equalTo(green); }];
例6:
竖屏
横屏
[yellow mas_makeConstraints:^(MASConstraintMaker *make) { //make.edges.equalTo(self.view).width.insets(UIEdgeInsetsMake(30, 10, 300, 10)); make.top.left.equalTo(@20); make.right.mas_equalTo(-10); }]; [w mas_makeConstraints:^(MASConstraintMaker *make) { make.left.mas_equalTo(20); make.bottom.mas_equalTo(weakSelf.view).offset(-20); make.height.mas_equalTo(yellow); make.top.mas_equalTo(yellow.mas_bottom).offset(20); make.width.mas_equalTo(green); make.right.mas_equalTo(green.mas_left).offset(-20); }]; [green mas_makeConstraints:^(MASConstraintMaker *make) { make.top.mas_equalTo(yellow.mas_bottom).offset(20); make.left.equalTo(w.mas_right).offset(20); make.right.equalTo(yellow.mas_right); make.height.mas_equalTo(or.mas_height); }]; [or mas_makeConstraints:^(MASConstraintMaker *make) { make.top.mas_equalTo(yellow.mas_top).offset(20); make.left.mas_equalTo(yellow.mas_left).offset(30); make.width.mas_equalTo(bl.mas_width); }]; [cy mas_makeConstraints:^(MASConstraintMaker *make) { make.top.mas_equalTo(or.mas_bottom).offset(30); make.left.mas_equalTo(or.mas_left); make.height.mas_equalTo(or.mas_height); make.width.mas_equalTo(or.mas_width); make.bottom.mas_equalTo(yellow).offset(-20); }]; [bl mas_makeConstraints:^(MASConstraintMaker *make) { make.top.mas_equalTo(or.mas_top); make.left.mas_equalTo(or.mas_right).offset(20); make.bottom.mas_equalTo(cy.mas_bottom); make.right.mas_equalTo(weakSelf.view.mas_right).offset(-20); }];
ScrollView
屏幕快照 2015-12-07 下午7.33.20.png
UIScrollView *scr = [UIScrollView new]; scr.backgroundColor = [UIColor whiteColor]; [self.view addSubview:scr]; [scr mas_makeConstraints:^(MASConstraintMaker *make) { make.edges.equalTo(self.view).width.insets(UIEdgeInsetsMake(10, 10, 10, 10)); }]; UIView *container = [UIView new]; [scr addSubview:container]; [container mas_makeConstraints:^(MASConstraintMaker *make) { make.edges.equalTo(scr); make.width.equalTo(scr); }]; int count = 20; UIView *lastView = nil; for (int i = 0; i <= count; i++) { UIView *subView = [UIView new]; [container addSubview:subView]; subView.backgroundColor = [UIColor colorWithHue:( arc4random() % 256 / 256.0 )saturation:( arc4random() % 128 / 256.0 ) + 0.5 brightness:( arc4random() % 128 / 256.0 ) + 0.5 alpha:1]; [subView mas_makeConstraints:^(MASConstraintMaker *make) { make.left.and.right.equalTo(container); make.height.mas_equalTo(@(20 * i)); if (lastView) { // lastView存在时 以其底部为下一个view的顶部 make.top.mas_equalTo(lastView.mas_bottom); } else { // lastView不存在时 以父视图的顶部为基准 make.top.mas_equalTo(container.mas_top); } }]; lastView = subView; } [container mas_makeConstraints:^(MASConstraintMaker *make) { make.bottom.equalTo(lastView.mas_bottom); }];
如图:
屏幕快照 2015-12-07 下午8.55.10.png
屏幕快照 2015-12-07 下午8.55.22.png
mas_updateConstraints
利用它来更新约束
初始时约束:
[_textField mas_makeConstraints:^(MASConstraintMaker *make) { make.size.mas_equalTo(CGSizeMake(200, 30)); make.bottom.mas_equalTo(-40); make.centerX.equalTo(weakSelf.view.mas_centerX); }];
键盘弹出在消息方法里更新约束:
-(void)keyBoardWillShow:(NSNotification*)noti { // 获取键盘基本信息(动画时长与键盘高度) NSDictionary *userInfo = [noti userInfo]; CGRect rect = [userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue]; CGFloat keyboardHeight = CGRectGetHeight(rect); CGFloat keyboardDuration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]; // 修改下边距约束 [_textField mas_updateConstraints:^(MASConstraintMaker *make) { make.bottom.mas_equalTo(-keyboardHeight); }]; // 更新约束 [UIView animateWithDuration:keyboardDuration animations:^{ [self.view layoutIfNeeded]; }]; }
键盘收起时在textField代理方法中再次更新约束
-(void)keyboardWillDisappear:(NSNotification *)noti { // 获取键盘基本信息(动画时长与键盘高度) NSDictionary *userInfo = [noti userInfo]; CGRect rect = [userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];// CGFloat keyboardHeight = CGRectGetHeight(rect); CGFloat keyboardDuration =[userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]; [_textField mas_updateConstraints:^(MASConstraintMaker *make) { make.bottom.mas_equalTo(-40); }]; [UIView animateWithDuration:keyboardDuration animations:^{ [self.view layoutIfNeeded]; }]; }
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