WHC_AutoLayout

• iOS and Mac OS X platforms currently in use the fastest the simplest development to build the UI layout automatically open source library, strong dynamic layout constraint handling capacity
• Service to update constraints, convenient and quick dynamic UI layout.

Swift4.+ version 👉 WHC_Layout

修改ios11安全布局机制增加whc_IsSafe控制api 布局api内部自动支持兼容处理iphonex头部齐刘海和底部黑线

添加UILayoutGuide，safeAreaLayoutGuide约束支持

重构布局核心升级基于二叉树层遍历算法搜索约束主视图,对于自动处理跨视图层复杂约束关系更健壮可靠

添加抗拉伸和抗压缩api支持链式调用

Introduce

• Adopt chain layout Api calls convenient
• Include one line of code to calculate UITableViewCell highly module
• Contains WHC_StackView module (UIStackView purpose alternative system)
• Automatic identification of the same type conflict and update the new constraints
• Support change constraints priority
• Support delete constraints
• Support iOS and Mac OS X
• Automatic covering and modify the conflict with type constraints

Require

• iOS 8.0+ / Mac OS X 10.11+ / tvOS 9.0+
• Xcode 8.0 or later

Note

• When the view call removeFromSuperview the view must call whc_ResetConstraints to clear the cache constraint

Install

• CocoaPods: pod 'WHC_AutoLayoutKit'

Usage

UILayoutGuide，safeAreaLayoutGuide

UILayoutGuide * guide = UILayoutGuide.new;
UIView * view = UIView.new;

guide.whc_LeftSpace(10)
.whc_TopSpaceToView(0, self.view.safeAreaLayoutGuide)
.whc_RightSpace(10)
.whc_Height(30);

view.whc_LeftSpace(10)
.whc_RightSpace(10)
.whc_TopSpaceToView(0, guide)
.whc_Height(50);

Automatic height view

view.whc_LeftSpace(10)
    .whc_TopSpace(10)
    .whc_RightSpace(10)
    .whc_HeightAuto();

Use lessEqual or greaterEqual (width <= 100 && width >= 20)

view.whc_Width(100).whc_LessOrEqual()
    .whc_Width(20).whc_GreaterOrEqual()

Masonry/SnapKit update the constraint way unfriendly

[view mas_updateConstraints:^(MASConstraintMaker *make) {
    make.top.equalTo(superview.mas_top).with.offset(10); 
    make.left.equalTo(superview.mas_left).with.offset(20);
    make.bottom.equalTo(superview.mas_bottom).with.offset(-10);
    make.right.equalTo(superview.mas_right).with.offset(-10);
}];

Update the view constraints

Modify the view to the left from 20 other views

view.whc_LeftSpace(20);
// or
view.whc_LeftSpaceToView(20,otherView);

Can be directly modified constraints on the Xib and Storyboard

If the view of xib leading now amended as left constraints

/// First remove the xib view of leading and then add new constraints
view.whc_RemoveLayoutAttrs(NSLayoutAttributeLeading)
    .whc_LeftSpace(10);

Remove the constraint

Remove all constraints associated with view left

view.whc_RemoveLayoutAttrs(NSLayoutAttributeLeft);

To remove multiple constraints associated with view

view.whc_RemoveLayoutAttrs(NSLayoutAttributeLeft,NSLayoutAttributeLeading,NSLayoutAttributeTop);
// or 
view.whc_RemoveTo(linkView, attrs: NSLayoutAttributeLeft ...);

Modify the view constraint priority

Modify the view constraint for low priority right

view.whc_RightSpace(10)
    .whc_PriorityLow();

// The higher the priority, the less likely to be stretched
// 设置抗拉伸优先级,优先级越高越不容易被拉伸
label.whc_ContentHuggingPriority(UILayoutPriorityDefaultLow, UILayoutConstraintAxisHorizontal);

// 设置抗压缩优先级,优先级越高越不容易被压缩
// Compression priority, the higher the priority the less easy to be compressed
label.whc_ContentCompressionResistancePriority(UILayoutPriorityDefaultLow, UILayoutConstraintAxisHorizontal);

One line of code calculation cell height

No reuse way calculated cell height

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return [UITableViewCell whc_CellHeightForIndexPath:indexPath tableView:tableView];
}

Reuse way calculated cell height

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return [UITableViewCell whc_CellHeightForIndexPath:indexPath 
                                             tableView:tableView 
                                            identifier:@"kFirendsCircleCellIdentifier" 
                                           layoutBlock:^(UITableViewCell *cell) {
         /// use model layout cell
         [(FriendsCircleCell *)cell setFriendModel:_friendModelArray[indexPath.row]];
    }];
}

Use WHC_StackView

Create WHC_StackView

WHC_StackView * stackView = [WHC_StackView new];
[self.view addSubview: stackView];

Add constraint

stackView.whc_LeftSpace(10)
         .whc_TopSpace(10)
         .whc_RightSpace(10)
         .whc_HeightAuto();

Configuration stackView

1. Set the padding

stackView.whc_Edge = UIEdgeInsetsMake(10, 10, 10, 10); // 内边距

2. Set the layout direction

stackView.whc_Orientation = Vertical;                  // 自动垂直布局

3. Set the child views lateral clearance

stackView.whc_HSpace = 10;                             // 子视图横向间隙

4. Set the child views vertical clearance

stackView.whc_VSpace = 10;                             // 子视图垂直间隙

5. Add subview and start the layout

for (int i = 0; i < 4; i++) {
    UIView * view = [UIView new];
    [stackView addSubview:view];        
}
[stackView whc_StartLayout];

Prompt

For more UI layout automatically, WHC_StackView components, one line of code to calculate the cell height module, please download this demo to check the specific usage

Part of the WHC_AutoLayoutKit demo show

Licenses

All source code is licensed under the MIT License.