Layout--iOS

// 系统的约束代码

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    UIView *superView = self.view;

    UIView *viewDemo = [[UIView alloc] init];

    viewDemo.translatesAutoresizingMaskIntoConstraints = NO;

    viewDemo.backgroundColor = [UIColor orangeColor];

    [superView addSubview:viewDemo];

    UIEdgeInsets padding = UIEdgeInsetsMake(, , , );

    [superView addConstraints:@[

　　　　　　　　　　　// viewDemo顶部距离父视图superView顶部距离为padding.top(即为：10)，

                               [NSLayoutConstraint constraintWithItem:viewDemo attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeTop multiplier: constant:padding.top],

                               [NSLayoutConstraint constraintWithItem:viewDemo attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeLeft multiplier: constant:padding.left],

                               [NSLayoutConstraint constraintWithItem:viewDemo attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeRight multiplier: constant:-padding.right],

                               [NSLayoutConstraint constraintWithItem:viewDemo attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeBottom multiplier: constant:-padding.bottom]

                               ]];

}

// 注：若是把右边约束去掉，改为如下语句

// [NSLayoutConstraint constraintWithItem:viewDemo attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeWidth multiplier:0.5 constant:0]

// 则viewDemo的宽度变为superView的0.5倍！！

//***************************************************

// VFL语言

　 UIView *viewLeft = [[UIView alloc] init];

    viewLeft.translatesAutoresizingMaskIntoConstraints = NO;

    viewLeft.backgroundColor = [UIColor orangeColor];

    [self.view addSubview:viewLeft];

    UIView *viewRight = [[UIView alloc] init];

    viewRight.translatesAutoresizingMaskIntoConstraints = NO;

    viewRight.backgroundColor = [UIColor redColor];

    [self.view addSubview:viewRight];

    // horizontal：水平方向距左边10，距右边10

    //简单说来，NSDictionaryOfVariableBindings(scrollView)就等于@{@”scrollView”: scrollView}

    NSDictionary *constraintDict = NSDictionaryOfVariableBindings(viewLeft,viewRight);

    NSArray *hConstraintArrayLeft = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(10)-[viewLeft]-(10)-|" options: metrics:nil views:constraintDict];

    // vertical： 垂直方向距顶部30，控件高度100

    NSArray *vConstraintArrayLeft = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(30)-[viewLeft(100)]" options: metrics:nil views:constraintDict];

    // 添加到父视图上

    [self.view addConstraints:hConstraintArrayLeft];

    [self.view addConstraints:vConstraintArrayLeft];

    NSArray *hConstraintArrayRight = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(10)-[viewRight]-(10)-|" options: metrics:nil views:constraintDict];

    // viewRight距viewLeft的垂直距离为50

    NSArray *vConstraintArrayRight = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[viewLeft]-(50)-[viewRight(200)]" options: metrics:nil views:constraintDict];

    [self.view addConstraints:hConstraintArrayRight];

    [self.view addConstraints:vConstraintArrayRight];

//***************************************************

// 三方库：Masonry

// 居中

// 快速定义一个weakSelf，用于block里面，防止循环引用

#define WS(weakSelf) __weak __typeof(&*self)weakSelf = self

WS(ws);

UIView *sv = [UIView new];

sv.backgroundColor = [UIColor orangeColor];

// 在做autoLayout之前一定要先将view添加到superView上否则会报错

[self.view addSubview:sv];

[sv mas_makeConstraints:^(MASConstraintMaker *make) {

// 居中

make.center.equalTo(ws.view);

// 设置size

make.size.mas_equalTo(CGSizeMake(300, 300));

}];

3. [初级] 让两个高度为150的view垂直居中且等宽且等间隔排列间隔为10(自动计算其宽度)

int padding1 = 10;

[sv2 mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerY.mas_equalTo(sv.mas_centerY);

make.left.equalTo(sv.mas_left).with.offset(padding1);

make.right.equalTo(sv3.mas_left).with.offset(-padding1);

make.height.mas_equalTo(@150);

make.width.equalTo(sv3);

}];

[sv3 mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerY.mas_equalTo(sv.mas_centerY);

make.left.equalTo(sv2.mas_right).with.offset(padding1);

make.right.equalTo(sv.mas_right).with.offset(-padding1);

make.height.mas_equalTo(@150);

make.width.equalTo(sv2);

}];

代码效果

这里我们在两个子view之间互相设置的约束可以看到他们的宽度在约束下自动的被计算出来了

4. [中级] 在UIScrollView顺序排列一些view并自动计算contentSize

UIScrollView *scrollView = [UIScrollView new];

scrollView.backgroundColor = [UIColor whiteColor];

[sv addSubview:scrollView];

[scrollView mas_makeConstraints:^(MASConstraintMaker *make) {

make.edges.equalTo(sv).with.insets(UIEdgeInsetsMake(5,5,5,5));

}];

UIView *container = [UIView new];

[scrollView addSubview:container];

[container mas_makeConstraints:^(MASConstraintMaker *make) {

make.edges.equalTo(scrollView);

make.width.equalTo(scrollView);

}];

int count = 10;

UIView *lastView = nil;

for ( int i = 1 ; i <= count ; ++i )

{

UIView *subv = [UIView new];

[container addSubview:subv];

subv.backgroundColor = [UIColor colorWithHue:( arc4random() % 256 / 256.0 )

saturation:( arc4random() % 128 / 256.0 ) + 0.5

brightness:( arc4random() % 128 / 256.0 ) + 0.5

alpha:1];

[subv mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.and.right.equalTo(container);

make.height.mas_equalTo(@(20*i));

if ( lastView )

{

make.top.mas_equalTo(lastView.mas_bottom);

}

else

{

make.top.mas_equalTo(container.mas_top);

}

}];

lastView = subv;

}

[container mas_makeConstraints:^(MASConstraintMaker *make) {

make.bottom.equalTo(lastView.mas_bottom);

}];

头部效果

尾部效果

从scrollView的scrollIndicator可以看出 scrollView的内部已如我们所想排列好了

这里的关键就在于container这个view起到了一个中间层的作用能够自动的计算uiscrollView的contentSize

5. [高级] 横向或者纵向等间隙的排列一组view

很遗憾 autoLayout并没有直接提供等间隙排列的方法(Masonry的官方demo中也没有对应的案例) 但是参考案例3 我们可以通过一个小技巧来实现这个目的为此我写了一个Category

@implementation UIView(Masonry_LJC)

- (void) distributeSpacingHorizontallyWith:(NSArray*)views

{

NSMutableArray *spaces = [NSMutableArray arrayWithCapacity:views.count+1];

for ( int i = 0 ; i < views.count+1 ; ++i )

{

UIView *v = [UIView new];

[spaces addObject:v];

[self addSubview:v];

[v mas_makeConstraints:^(MASConstraintMaker *make) {

make.width.equalTo(v.mas_height);

}];

}

UIView *v0 = spaces[0];

__weak __typeof(&*self)ws = self;

[v0 mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(ws.mas_left);

make.centerY.equalTo(((UIView*)views[0]).mas_centerY);

}];

UIView *lastSpace = v0;

for ( int i = 0 ; i < views.count; ++i )

{

UIView *obj = views[i];

UIView *space = spaces[i+1];

[obj mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(lastSpace.mas_right);

}];

[space mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(obj.mas_right);

make.centerY.equalTo(obj.mas_centerY);

make.width.equalTo(v0);

}];

lastSpace = space;

}

[lastSpace mas_makeConstraints:^(MASConstraintMaker *make) {

make.right.equalTo(ws.mas_right);

}];

}

- (void) distributeSpacingVerticallyWith:(NSArray*)views

{

NSMutableArray *spaces = [NSMutableArray arrayWithCapacity:views.count+1];

for ( int i = 0 ; i < views.count+1 ; ++i )

{

UIView *v = [UIView new];

[spaces addObject:v];

[self addSubview:v];

[v mas_makeConstraints:^(MASConstraintMaker *make) {

make.width.equalTo(v.mas_height);

}];

}

UIView *v0 = spaces[0];

__weak __typeof(&*self)ws = self;

[v0 mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(ws.mas_top);

make.centerX.equalTo(((UIView*)views[0]).mas_centerX);

}];

UIView *lastSpace = v0;

for ( int i = 0 ; i < views.count; ++i )

{

UIView *obj = views[i];

UIView *space = spaces[i+1];

[obj mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(lastSpace.mas_bottom);

}];

[space mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(obj.mas_bottom);

make.centerX.equalTo(obj.mas_centerX);

make.height.equalTo(v0);

}];

lastSpace = space;

}

[lastSpace mas_makeConstraints:^(MASConstraintMaker *make) {

make.bottom.equalTo(ws.mas_bottom);

}];

}

@end

简单的来测试一下

UIView *sv11 = [UIView new];

UIView *sv12 = [UIView new];

UIView *sv13 = [UIView new];

UIView *sv21 = [UIView new];

UIView *sv31 = [UIView new];

sv11.backgroundColor = [UIColor redColor];

sv12.backgroundColor = [UIColor redColor];

sv13.backgroundColor = [UIColor redColor];

sv21.backgroundColor = [UIColor redColor];

sv31.backgroundColor = [UIColor redColor];

[sv addSubview:sv11];

[sv addSubview:sv12];

[sv addSubview:sv13];

[sv addSubview:sv21];

[sv addSubview:sv31];

//给予不同的大小测试效果

[sv11 mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerY.equalTo(@[sv12,sv13]);

make.centerX.equalTo(@[sv21,sv31]);

make.size.mas_equalTo(CGSizeMake(40, 40));

}];

[sv12 mas_makeConstraints:^(MASConstraintMaker *make) {

make.size.mas_equalTo(CGSizeMake(70, 20));

}];

[sv13 mas_makeConstraints:^(MASConstraintMaker *make) {

make.size.mas_equalTo(CGSizeMake(50, 50));

}];

[sv21 mas_makeConstraints:^(MASConstraintMaker *make) {

make.size.mas_equalTo(CGSizeMake(50, 20));

}];

[sv31 mas_makeConstraints:^(MASConstraintMaker *make) {

make.size.mas_equalTo(CGSizeMake(40, 60));

}];

[sv distributeSpacingHorizontallyWith:@[sv11,sv12,sv13]];

[sv distributeSpacingVerticallyWith:@[sv11,sv21,sv31]];

[sv showPlaceHolderWithAllSubviews];

[sv hidePlaceHolder];

代码效果

perfect! 简洁明了的达到了我们所要的效果

这里所用的技巧就是使用空白的占位view来填充我们目标view的旁边这点通过图上的空白标注可以看出来

引自：http://www.cocoachina.com/ios/20141219/10702.html

若有侵权，请告知

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