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)
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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
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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
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@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
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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
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