1.mas_equalTo和equalTo
默认情况下，mas_equalTo有自动包装功能，比如自动将20包装为@20
equalTo没有自动包装功能
如果添加了下面的宏，那么mas_equalTo和equalTo就没有区别
#define MAS_SHORTHAND_GLOBALS
// 注意：这个宏一定要添加到#import "Masonry.h"前面
// 蓝色控件
UIView *blueView = [[UIView alloc] init];
blueView.backgroundColor = [UIColor blueColor];
[self.view addSubview:blueView];
// 尺寸限制：100x100
// 位置：粘着父控件右下角，间距是20
// 这个方法只会添加新的约束
[blueView mas_makeConstraints:^(MASConstraintMaker *make) {
// 宽度约束
make.width.equalTo(@100);
// 高度约束
make.height.equalTo(@100);
// 右边
make.right.equalTo(self.view.mas_right).offset(-20);
// 顶部
make.top.equalTo(self.view.mas_top).offset(20);
}];
[blueView mas_makeConstraints:^(MASConstraintMaker *make) {
// 宽度约束
make.width.mas_equalTo(100);
// 高度约束
make.height.mas_equalTo(100);
// 右边
make.right.equalTo(self.view).offset(-20);
// 顶部
make.top.equalTo(self.view).offset(20);
}];
[blueView mas_makeConstraints:^(MASConstraintMaker *make) {
// 宽度高度约束
make.width.height.mas_equalTo(100);
// 右边
make.right.equalTo(self.view).offset(-20);
// 顶部
make.top.equalTo(self.view).offset(20);
}];
[blueView mas_makeConstraints:^(MASConstraintMaker *make) {
// 宽度高度约束
// make.size.equalTo([NSValue valueWithCGSize:CGSizeMake(100, 100)]);
// make.size.mas_equalTo(CGSizeMake(100, 100));
make.size.mas_equalTo(100);
// 右边
make.right.equalTo(self.view).offset(-20);
// 顶部
make.top.equalTo(self.view).offset(20);
}];
[blueView mas_makeConstraints:^(MASConstraintMaker *make) {
// 宽度高度约束
make.height.mas_equalTo(self.view).multipliedBy(0.5).offset(-50);
// 右边
make.right.mas_equalTo(self.view).offset(-20);
// make.right.offset(-20);
// 顶部
make.top.mas_equalTo(self.view).offset(20);
// make.top.offset(20);
}];
2.width和mas_width
默认情况下，width是make对象的一个属性，用来添加宽度约束用的，表示对宽度进行约束
mas_width是一个属性值，用来当做equalTo的参数，表示某个控件的宽度属性
如果添加了下面的宏，mas_width也可以写成width
#define MAS_SHORTHAND
mas_height、mas_centerX以此类推
// 蓝色控件
UIView *blueView = [[UIView alloc] init];
blueView.backgroundColor = [UIColor blueColor];
[self.view addSubview:blueView];
// 红色控件
UIView *redView = [[UIView alloc] init];
redView.backgroundColor = [UIColor redColor];
[self.view addSubview:redView];
// 添加约束
CGFloat margin = 20;
CGFloat height = 50;
[blueView makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(self.view.left).offset(margin);
make.right.equalTo(redView.left).offset(-margin);
make.bottom.equalTo(self.view.bottom).offset(-margin);
make.height.equalTo(height);
make.top.equalTo(redView.top);
make.bottom.equalTo(redView.bottom);
make.width.equalTo(redView.width);
}];
[redView makeConstraints:^(MASConstraintMaker *make) {
make.right.equalTo(self.view.right).offset(-margin);
}];
3.以下方法都仅仅是为了提高可读性，可有可无
- (MASConstraint *)with {
return self;
}
- (MASConstraint *)and {
return self;
}
4.约束的类型：
- 尺寸：width\height\size
- 边界：left\leading\right\trailing\top\bottom
- 中心点：center\centerX\centerY
- 边界：edges
- (void)test4
{
// 蓝色控件
UIView *blueView = [[UIView alloc] init];
blueView.backgroundColor = [UIColor blueColor];
[self.view addSubview:blueView];
// 添加约束
[blueView makeConstraints:^(MASConstraintMaker *make) {
// make.width.equalTo(self.view.width).multipliedBy(0.5);
// make.height.equalTo(self.view.height).multipliedBy(0.5).offset(-100);
make.width.equalTo(100);
make.height.equalTo(100);
make.centerX.equalTo(self.view.centerX);
make.centerY.equalTo(self.view.centerY);
}];
}
- (void)test3
{
// 蓝色控件
UIView *blueView = [[UIView alloc] init];
blueView.backgroundColor = [UIColor blueColor];
[self.view addSubview:blueView];
// 距离父控件四周都是50间距
// [blueView mas_makeConstraints:^(MASConstraintMaker *make) {
// make.left.mas_equalTo(self.view.mas_left).offset(50);
// make.right.mas_equalTo(self.view.mas_right).offset(-50);
// make.top.mas_equalTo(self.view.mas_top).offset(50);
// make.bottom.mas_equalTo(self.view.mas_bottom).offset(-50);
// }];
// [blueView mas_makeConstraints:^(MASConstraintMaker *make) {
// make.left.mas_equalTo(self.view).offset(50);
// make.right.mas_equalTo(self.view).offset(-50);
// make.top.mas_equalTo(self.view).offset(50);
// make.bottom.mas_equalTo(self.view).offset(-50);
// }];
// [blueView mas_makeConstraints:^(MASConstraintMaker *make) {
// make.left.offset(50);
// make.right.offset(-50);
// make.top.offset(50);
// make.bottom.offset(-50);
// }];
// [blueView mas_makeConstraints:^(MASConstraintMaker *make) {
// make.left.top.offset(50);
// make.right.bottom.offset(-50);
// }];
[blueView mas_makeConstraints:^(MASConstraintMaker *make) {
// make.edges.mas_equalTo(self.view).insets(UIEdgeInsetsMake(50, 50, 50, 50));
make.center.mas_equalTo(self.view).insets(UIEdgeInsetsZero);
}];
}
- (void)test2
{
// 蓝色控件
UIView *blueView = [[UIView alloc] init];
blueView.backgroundColor = [UIColor blueColor];
[self.view addSubview:blueView];
// 居中（水平+垂直）
// 尺寸是父控件的一半
[blueView mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(self.view).multipliedBy(0.5);
make.center.mas_equalTo(self.view);
// make.centerX.mas_equalTo(self.view);
// make.centerY.mas_equalTo(self.view);
}];
}
5.remakeConstraints和updateConstraints
// 这个方法会将以前的所有约束删掉，添加新的约束
[blueView mas_remakeConstraints:^(MASConstraintMaker *make) {
}];
// 这个方法将会覆盖以前的某些特定的约束
[blueView mas_updateConstraints:^(MASConstraintMaker *make) {
}];
6.Masonry自动计算cell行高
（1）导入UITableViewCell+HYBMasonryAutoCellHeight和UITableView+HYBCacheHeight.h这个分类
（2）设置关键依赖：
要想自动计算出 cell 的行高，我们还需要指定以哪个视图作为 cell 的最后一个视图，比如我们最后要添加一条线，我们可以以这条线作为 hyb_lastViewInCell ，如果这条线还需要距离底部一定距离，那么可以设置 hyb_bottomOffsetToCell 。
一般在cell 的configCellWithModel: indexPath:方法中设置这两个属性。
这两个属性在分类中，直接可以使用。
- (void)configCellWithModel:(InteractCommentModel *)infoModel indexPath:(NSIndexPath *)indexPath {
self.infoModel = infoModel;
self.indexPath = indexPath;
[_headImg sd_setImageWithURL:[NSURL URLWithString:infoModel.commUserHeadPic] placeholderImage:[UIImage imageNamed:@"SZ_wodetouxiang"]];
if (![infoModel.commUserNick isEqualToString:@""]) {
_name.text = infoModel.commUserNick;
}else{
_name.text = @"匿名用户";
}
_comment.text = infoModel.commContent;
_time.text = infoModel.commTime;
if ([infoModel.commUserLevel isEqualToString:@"2"]) {
//_commentButton.hidden = YES;
_mark.hidden = NO;
}
[_line mas_updateConstraints:^(MASConstraintMaker *make) {
make.height.mas_equalTo(0);
}];
[_tableView mas_updateConstraints:^(MASConstraintMaker *make) {
make.height.mas_equalTo(0);
}];
[_moreBtn mas_updateConstraints:^(MASConstraintMaker *make) {
make.height.mas_equalTo(0);
}];
_tableView.hidden = YES;
_moreBtn.hidden = YES;
_line.hidden = YES;
self.hyb_lastViewInCell = self.comment;
self.hyb_bottomOffsetToCell = 8;
}
（3）要计算行高，只需要在 UITableView 的计算行高的代理方法中调用此API即可：
/**
* 通过此方法来计算行高，需要在config中调用配置数据的API
*
* @param indexPath 必传，对应的indexPath
* @param confi 必须要实现，且需要调用配置数据的API
*
* @return 计算的行高
*/
+ (CGFloat)hyb_heightForIndexPath:(NSIndexPath *)indexPathconfig:(HYBCellBlock)config;
在调用时， config 传回来了 cell 对象，需要在调用处调用方法来配置好数据，才能正确地计算出 cell 的行高。通常是这样调用的：
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
InteractCommentModel * infoModel = self.listArry[indexPath.row];
CGFloat h = [BaseInteractCommentCell hyb_heightForTableView:tableView config:^(UITableViewCell *sourceCell) {
BaseInteractCommentCell *cell = (BaseInteractCommentCell *)sourceCell;
[cell configCellWithModel:infoModel indexPath:indexPath];
} cache:^NSDictionary *{
NSDictionary *cache = @{kHYBCacheUniqueKey : infoModel.commId,
kHYBCacheStateKey : @"",
kHYBRecalculateForStateKey : @(infoModel.ShouldUpdateCache)};
infoModel.ShouldUpdateCache = YES;
return cache;
}];
return h;
}