masonry实现等间距

#import "ViewController.h"
#import <Masonry/Masonry.h>

static const CGFloat ITEM_SIZE = 32;
static const NSUInteger ITEM_COUNT = 4;

@interface ViewController ()

@property (strong, nonatomic) UIView *containerView1;
@property (strong, nonatomic) UIView *containerView2;
@property (assign, nonatomic) CGFloat maxWidth;
@property (strong, nonatomic) NSArray *imageNames;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
  
    [self.view addSubview:self.containerView1];
    [self.view addSubview:self.containerView2];
    
    _imageNames = @[@"bluefaces_1", @"bluefaces_2", @"bluefaces_3", @"bluefaces_4"];

    [self initContainer1];
    [self initContainer2];
}

// 利用透明等宽度的SpaceView实现等间距
- (void)initContainer1 {
    UIView *lastSpaceView = [UIView new];
    lastSpaceView.backgroundColor = [UIColor greenColor];
    [_containerView1 addSubview:lastSpaceView];
    
    [lastSpaceView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.top.bottom.mas_equalTo(_containerView1);
    }];
    
    for (NSUInteger i = 0; i < ITEM_COUNT; i++) {
        UIView *itemView = [self getItemViewWithIndex:i];
        [_containerView1 addSubview:itemView];
        
        [itemView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.height.width.mas_equalTo(@(ITEM_SIZE));
            make.left.mas_equalTo(lastSpaceView.mas_right);
            make.centerY.mas_equalTo(_containerView1.mas_centerY);
        }];
        
        UIView *spaceView = [UIView new];
        spaceView.backgroundColor = [UIColor greenColor];
        [_containerView1 addSubview:spaceView];
        
        [spaceView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.mas_equalTo(itemView.mas_right).with.priorityHigh(); // 降低优先级，防止宽度不够出现约束冲突
            make.top.bottom.mas_equalTo(_containerView1);
            make.width.mas_equalTo(lastSpaceView.mas_width);
        }];
        lastSpaceView = spaceView;
    }
    
    [lastSpaceView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.mas_equalTo(_containerView1.mas_right);
    }];
}

// 直接设置multiplier实现等间距
- (void)initContainer2 {
    for (NSUInteger i = 0; i < ITEM_COUNT; i++) {
        UIView *itemView = [self getItemViewWithIndex:i];
        [_containerView2 addSubview:itemView];

        [itemView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.width.height.mas_equalTo(ITEM_SIZE);
            make.centerY.mas_equalTo(_containerView2.mas_centerY);
            make.centerX.mas_equalTo(_containerView2.mas_right).multipliedBy(((CGFloat)i + 1) / ((CGFloat)ITEM_COUNT + 1));
        }];
    }
}

- (UIView *)getItemViewWithIndex:(NSUInteger)index {
    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:_imageNames[index % _imageNames.count]]];
    imageView.contentMode = UIViewContentModeScaleAspectFit;
    return imageView;
}

- (UIView *)containerView1 {
    if (!_containerView1) {
        _containerView1 = [[UIView alloc] init];
        _containerView1.backgroundColor = [[UIColor redColor] colorWithAlphaComponent:0.1];
        _containerView1.frame = CGRectMake(0, 100, [UIScreen mainScreen].bounds.size.width, 40);
    }
    return _containerView1;
}

- (UIView *)containerView2 {
    if (!_containerView2) {
        _containerView2 = [[UIView alloc] init];
        _containerView2.backgroundColor = [[UIColor redColor] colorWithAlphaComponent:0.1];
        _containerView2.frame = CGRectMake(0, 150, [UIScreen mainScreen].bounds.size.width, 40);
    }
    return _containerView2;
}

@end