Auto Layout
XCode5+
Auto Layout Concepts
核心的概念是约束。
Constraint Basics
- Constant value
- Relation
- Priority level
约束是累积的，重复定义一个按钮的宽度的约束不会覆盖上一个约束。因此你需要移除上一个约束。
Working with Constraints in Interface Builder(IB)
Interface Builder 简称IB
Adding Constraints
Control-Drag
当然我喜欢右击拉开，一样的效果。
Aligh and Pin 菜单
这个菜单在右下角。
Editing Constraints
Deleting Constraints
Canvas or in the outline view
Working with Auto Layout Programmatically
You can add constraints programmatically
Creating Constraints Programmatically
NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(self.button1, self.button2);NSArray *constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"[button1]-[button2]" options:0 metrics:nil views:viewsDictionary];
Resolving Auto Layout Issues
On the canvas. Misplaced or ambiguous constraints are shown in orange, conflicting constraints are red,and red dotted frames show the predicted runtime positions of misplaced or ambiguous views.
- Resolving View Misplacement
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Resolving Constraint Conflicts
Auto Layout by Example
未完待续