[AutoResize]
控件初始化流程：
创建控件->设定预设坐标位置->设定自适应规则->AddToSubview(->自适应显示)
自适应规则示例：
//控件靠左上角(右边和下边自适应)
view.autoresizingMask = (UIViewAutoresizingFlexibleBottomMargin |
UIViewAutoresizingFlexibleRightMargin);
//控件靠右上角(左边和下边自适应)
view.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin |
UIViewAutoresizingFlexibleBottomMargin);
//控件宽等比例，靠上不变(左、右、宽自适应，下自适应)
view.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin |
UIViewAutoresizingFlexibleWidth |
UIViewAutoresizingFlexibleRightMargin |
UIViewAutoresizingFlexibleBottomMargin);
//横向距边框距离不变，宽度自适应，靠上位置不变
view.autoresizingMask = (UIViewAutoresizingFlexibleWidth |
UIViewAutoresizingFlexibleBottomMargin);
//跟随父控件等比缩放
view.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin |
UIViewAutoresizingFlexibleWidth|
UIViewAutoresizingFlexibleRightMargin |
UIViewAutoresizingFlexibleBottomMargin |
UIViewAutoresizingFlexibleHeight |
UIViewAutoresizingFlexibleTopMargin);
//跟随父控件缩放，距上、下、左、右边框位置不变
view.autoresizingMask = (UIViewAutoresizingFlexibleHeight |
UIViewAutoresizingFlexibleWidth);
[AutoLayout]
控件初始化流程：
创建控件(->设定预设坐标位置) ->AddToSubview ->设定自适应规则 (->自适应显示)
自适应代码示例:
UIView *view = [[UIView alloc] init];
[self.view addSubview:view];
UIView *item1 = [[UIView alloc] init];
UIView *item2 = [[UIView alloc] init];
UIView *item3 = [[UIView alloc] init];
UIView *item4 = [[UIView alloc] init];
[self.view addSubview:item1];
[self.view addSubview:item2];
[self.view addSubview:item3];
[self.view addSubview:item4];
///示例 1: 设定距边框为5pix宽高自适应且不小于（300，200）
NSMutableArray *constraits1 = [NSMutableArray array];
//设定X方向规则:距左右边距为5pix不变，宽度不小于300
[constraits1 addObjectsFromArray:[NSLayoutConstraint
constraintsWithVisualFormat:@"H:|-5-[view(>=300)]-5-|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(view)]];
//设定Y方向规则:距上下边距为5pix不变，高度不小于200
[constraits1 addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-5-[view(>=200)]-5-|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(view)]];
//规则生效
[self.view addConstraints:constraits1];
///示例 2: 设定X和Y方向等比缩放，且宽、高分别为父控件的0.9、0.8倍，中心位置对齐
NSMutableArray *constraits2 = [NSMutableArray array];
//设定X方向规则
//设定view的宽度为父控件的0.9倍
[constraits2 addObject:[NSLayoutConstraint
constraintWithItem:view
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeWidth
multiplier:0.9
constant:0]];
//设定View的X中心位置跟父控件的中心位置一样
[constraits2 addObject:[NSLayoutConstraint
constraintWithItem:view
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeCenterX
multiplier:1.0 constant:0]];
//设定Y方向规则
//设定View的高度为父控件的0.8倍
[constraits2 addObject:[NSLayoutConstraint constraintWithItem:view
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeHeight
multiplier:0.8
constant:0]];
//设定View的Y中心位置跟父控件的中心位置一样
[constraits2 addObject:[NSLayoutConstraint
constraintWithItem:view
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeCenterY
multiplier:1.0
constant:0]];
//规则生效
[self.view addConstraints:constraits2];
///示例 3: 设定两个控件 等宽
NSMutableArray *constraits3 = [NSMutableArray array];
[constraits3 addObjectsFromArray:[NSLayoutConstraint
constraintsWithVisualFormat:@"H:[item1(==item2)]"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(item1, item2)]];
//规则生效
[self.view addConstraints:constraits3];
///示例 4: 设定多个控件等间距，且控件宽度不小于50
NSMutableArray *constraits4 = [NSMutableArray array];
[constraits4 addObjectsFromArray:[NSLayoutConstraint
constraintsWithVisualFormat:@"H:|-5-[item1(>=50)-5-[item2(>=50)]-5-[item3(>=50)]-5-[item4(>=50)]]-5-|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(item1, item2, item3, item4)]];
//规则生效
[self.view addConstraints:constraits4];
相关文档：
InterfaceBuild中使用AutoLayout
Visual Format Language