iOS mas_makeConstraint约束和autolayout

要创建一个试图,距离上下左右都是10的这样一个约束需要写上很多代码,然而现在是使用Masonry的效果

UIEdgeInsets padding = UIEdgeInsetsMake(10, 10, 10, 10);[view1 mas_makeConstraints:^(MASConstraintMaker *make) {    make.top.equalTo(superview.mas_top).with.offset(padding.top); //with is an optional semantic filler make.left.equalTo(superview.mas_left).with.offset(padding.left);    make.bottom.equalTo(superview.mas_bottom).with.offset(-padding.bottom);    make.right.equalTo(superview.mas_right).with.offset(-padding.right);}]; 

甚至我们这样写得更加简洁

[view1 mas_makeConstraints:^(MASConstraintMaker *make) {    make.edges.equalTo(superview).with.insets(padding);}];

接下来我们来观看下Masonry中的一些常用属性

// 左侧  @property (nonatomic, strong, readonly) MASConstraint *left; // 顶部 @property (nonatomic, strong, readonly) MASConstraint *top; // 右侧 @property (nonatomic, strong, readonly) MASConstraint *right; // 底部 @property (nonatomic, strong, readonly) MASConstraint *bottom; // 首部 @property (nonatomic, strong, readonly) MASConstraint *leading; // 尾部 @property (nonatomic, strong, readonly) MASConstraint *trailing; // 宽  @property (nonatomic, strong, readonly) MASConstraint *width; // 高  @property (nonatomic, strong, readonly) MASConstraint *height; // 中心点x @property (nonatomic, strong, readonly) MASConstraint *centerX; // 中心点y @property (nonatomic, strong, readonly) MASConstraint *centerY; // 文本基线 @property (nonatomic, strong, readonly) MASConstraint *baseline;

 

居中显示视图

UIView *myView = [[UIView alloc] init];myView.backgroundColor = [UIColor blueColor];[self.view addSubview:myView];    [myView mas_makeConstraints:^(MASConstraintMaker *make) { // 设置当前center和父视图的center一样 make.center.mas_equalTo(self.view); // 设置当前视图的大小 make.size.mas_equalTo(CGSizeMake(300, 300));}]; 

效果图

可以看到我们已经创建出一个位置居中,并且视图大小为300×300

 

设置视图并排

UIView *view1 = [[UIView alloc] init];view1.backgroundColor = [UIColor redColor];[myView addSubview:view1]; UIView *view2 = [[UIView alloc] init];view2.backgroundColor = [UIColor yellowColor];[myView addSubview:view2]; int padding = 10;    [view1 mas_makeConstraints:^(MASConstraintMaker *make) { // 设置其位于父视图的Y的中心位置 make.centerY.mas_equalTo(myView.mas_centerY); // 设置其左侧和父视图偏移10个像素 make.left.equalTo(myView).with.offset(padding); // 设置其右侧和view2偏移10个像素 make.right.equalTo(view2.mas_left).with.offset(-padding); // 设置高度 make.height.mas_equalTo(@120); // 设置其宽度 make.width.equalTo(view2);}];    [view2 mas_makeConstraints:^(MASConstraintMaker *make) {   make.centerY.mas_equalTo(myView.mas_centerY);   make.left.equalTo(view1.mas_right).with.offset(padding);   make.right.equalTo(myView).with.offset(-padding);   make.height.mas_equalTo(view1);   make.width.equalTo(view1);}];

效果图:

提醒一下,以下代码等价

make.left.equalTo(myView).with.offset(padding); 】 // 等价于  make.left.equalTo(myView.mas_left).with.offset(padding);

也就是说默认情况下括号里面只写了视图的时候,其自动帮你添加当前masxxx(代表前面你需要设置的约束的位置).比如上面两行代码设置的make.left,当括号里面只写了myView的时候,会自动追加为myView.mas_left。

 

多个视图间隔相同

注意下面设置宽度的时候是传递的数组,这样才能让多个视图进行等距离显示

 UIView *view1 = [[UIView alloc] init];view1.backgroundColor = [UIColor redColor];[myView addSubview:view1]; UIView *view2 = [[UIView alloc] init];view2.backgroundColor = [UIColor yellowColor];[myView addSubview:view2]; UIView *view3 = [[UIView alloc] init];view3.backgroundColor = [UIColor greenColor];[self.view addSubview:view3]; int padding = 10;[view1 mas_makeConstraints:^(MASConstraintMaker *make) { // 设置中心点  make.centerY.mas_equalTo(myView); // 设置左侧距离父视图10  make.left.equalTo(myView).with.offset(padding); // 设置右侧距离和view2的左侧相隔10 make.right.equalTo(view2.mas_left).with.offset(-padding); // 设置高度 make.height.mas_equalTo(@150); // 宽度设置和view2以及view3相同 make.width.equalTo(@[view2, view3]);}];    [view2 mas_makeConstraints:^(MASConstraintMaker *make) {   make.centerY.mas_equalTo(myView);   make.height.mas_equalTo(view1);   make.width.equalTo(@[view1, view3]);}];[view3 mas_makeConstraints:^(MASConstraintMaker *make) {   make.centerY.mas_equalTo(myView);   make.left.equalTo(view2.mas_right).with.offset(padding);   make.right.equalTo(myView).with.offset(-padding);   make.height.mas_equalTo(view1);   make.width.equalTo(@[view2, view1]);}]; 

效果图: