Masonry三方下載
本文參考：
地址1
地址2
地址3
地址4
*Masonry有哪些屬性
@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 只負責添加約束 AutoLayout不能同時存在兩條針對同一對象的約束否則會報錯 * mas_updateConstraints 針對上面的情況 會更新在block中出現的約束 不會導致出現兩個相同約束的情況 * mas_remakeConstraints 清除之前所有的約束只保留新的約束 * * 三種函數要配合使用 */
重點：
使用mas_makeConstrains方法的元素必須事先添加到父視圖中
mas_equalTo和equalTo區別：前者比后者多了類型轉換操作，支持CGSize CGPoint NSNumber UIEdgeinsets。mas_equalTo是equalTo的封裝，equalTo適用于基本數據類型，而mas_equaalTo適用于類似UIEdgeInsetsMake 等復雜類型，基本上它可以替換equalTo。
上左為正 下右為負 是因為坐標而來的 視圖坐標左上為原點 X向右為正 Y向下為正
舉例比較：
Make.left.equalTo(@64)可以這么寫才可以 字面量make.left.mas_equalTo(64);而mas_equalTo可以不用字面量
先試一下：一個View居中
// 防止block循環引用
__weak typeof (self)weakSelf = self; UIView *yellow = [UIView new];
yellow.backgroundColor = [UIColor yellowColor];// 切記添加到父視圖中
[self.view addSubview:yellow];
[yellow showPlaceHolder]; /**
* 設置約束
* 使用mas_MakeConstraints:添加約束
*/
[yellow mas_makeConstraints:^(MASConstraintMaker *make) { // 1.make就是添加約束的控件
// make.left.equalTo 的意思是左側和誰相同 .offset則是偏移量 上左[為正]下右[為負]
make.top.equalTo(self.view.mas_top).offset(30);// 和父視圖頂部間距30
make.left.equalTo(self.view.mas_left).offset(30);// 和父視圖左邊間距30
make.bottom.equalTo(self.view.mas_bottom).offset(-30);// 和父視圖底部間距30
make.right.equalTo(self.view.mas_right).offset(-30);// 和父視圖右邊間距30
// 2. 2等價于1 edges邊緣的意思
make.edges.equalTo(self.view).width.insets(UIEdgeInsetsMake(30, 30, 30, 30)); // 3. 還等價于
make.top.left.bottom.and.right.equalTo(self.view).width.insets(UIEdgeInsetsMake(30, 30, 30, 30)); // 4.此處給yellow一個size 且讓其居中make.size.mas_equalTo(CGSizeMake(300, 300));
make.center.equalTo(self.view);
}];size還可以這么寫兩者也相同
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);
兩個view
例1
如圖
如圖
[green mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(200, 120));// green大小
make.top.mas_equalTo(green.superview).offset(100);// green頂部到它父視圖的偏移量
make.bottom.mas_equalTo(yellow.mas_top).offset(-50);// 50如果為正就是green底部到yellow頂部距離為50 為負就是green下邊到yellow上邊為50
make.centerX.equalTo(green.superview.mas_centerX);// 中心點的X坐標和父視圖中心點的X相同 說人話就是在中間
}];
[yellow mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(250, 30)); // 給個size
make.centerX.equalTo(green.mas_centerX);// centerX和green一樣
}];make.size.equalTo(green);兩個view就相同大小
等同于
make.width.equalTo(green.mas_width);make.height.equalTo(green.mas_height);
例2：
兩個view
[green mas_makeConstraints:^(MASConstraintMaker *make) {
// 添加大小約束
make.size.mas_equalTo(CGSizeMake(100, 100));
// 添加左上邊距約束
make.left.and.top.mas_equalTo(20);
}];
[yellow mas_makeConstraints:^(MASConstraintMaker *make) {
// 大小和上邊距約束與green相同
make.size.and.top.equalTo(green);
// 添加右邊距約束 上左為正下右為負
make.right.mas_equalTo(-20);
}];這里的and和with都沒有具體操作只是拿來增加程序可讀性
例3：
例3
[green mas_makeConstraints:^(MASConstraintMaker *make) {
// 左上約束20 右側約束-20
make.left.and.top.mas_equalTo(20);
// 右邊約束為-20
make.right.mas_equalTo(-20);
}];
[yellow mas_makeConstraints:^(MASConstraintMaker *make) {
// 下右約束-20
make.bottom.and.right.mas_equalTo(-20);
// 高度和green相同
make.height.equalTo(green);
// 頂部到green底部距離為20
make.top.equalTo(green.mas_bottom).offset(20);
// 左側到視圖中心的距離為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) { // 左上下距離父視圖都為0
make.left.and.top.and.bottom.mas_equalTo(0); // 寬度為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底部距離父視圖centerY的距離為10
make.bottom.equalTo(weakSelf.view.mas_centerY).mas_equalTo(-10); // 左側距離gray距離為20
make.left.equalTo(gray).offset(20); // 右側距離gray距離20
make.right.equalTo(gray).offset(-20);
make.height.mas_equalTo(100);
}];
[light mas_makeConstraints:^(MASConstraintMaker *make) { // 頂部距離父視圖centerY為10
make.top.equalTo(weakSelf.view.mas_centerY).mas_equalTo(10); // 左右和高度與w相同
make.left.and.right.and.height.equalTo(w);
}];上下左右邊距
make.top.left.bottom.right.equalTo(weakSelf.view).width.insets(UIEdgeInsetsMake(20, 20, 100, 20));
等價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：
豎屏
橫屏
[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存在時 以其底部為下一個view的頂部
make.top.mas_equalTo(lastView.mas_bottom);
} else { // lastView不存在時 以父視圖的頂部為基準
make.top.mas_equalTo(container.mas_top);
}
}];
lastView = subView;
}
[container mas_makeConstraints:^(MASConstraintMaker *make) {
make.bottom.equalTo(lastView.mas_bottom);
}];如圖：
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 利用它來更新約束
初始時約束：
[_textField mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(200, 30));
make.bottom.mas_equalTo(-40);
make.centerX.equalTo(weakSelf.view.mas_centerX);
}];鍵盤彈出在消息方法里更新約束：
-(void)keyBoardWillShow:(NSNotification*)noti { // 獲取鍵盤基本信息（動畫時長與鍵盤高度）
NSDictionary *userInfo = [noti userInfo]; CGRect rect =
[userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue]; CGFloat keyboardHeight = CGRectGetHeight(rect); CGFloat keyboardDuration =
[userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]; // 修改下邊距約束
[_textField mas_updateConstraints:^(MASConstraintMaker *make) {
make.bottom.mas_equalTo(-keyboardHeight);
}]; // 更新約束
[UIView animateWithDuration:keyboardDuration animations:^{
[self.view layoutIfNeeded];
}];
}鍵盤收起時在textField代理方法中再次更新約束
-(void)keyboardWillDisappear:(NSNotification *)noti { // 獲取鍵盤基本信息（動畫時長與鍵盤高度）
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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