1、先上图：
一般排列的间隔会出现不准确的情况：（间隔10） |
而我们想要实现每个cell以最小间距紧密排列: |
|---|---|
IMG_0024.PNG
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IMG_0023.PNG
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2、原理：
1、（swift）UICollectionView Cell大小自适应 并靠左对齐最简单的实现
2、（OC）UICollectionView的无缝排序
- 1、重写一个继承自UICollectionViewFlowLayout类的子类：
复杂的方法是自己写一个UICollectionViewLayout，这里我选择了一种更简单的方法，根据系统的布局来进行调整，创建一个UICollectionViewLeftFlowLayout类继承UICollectionViewFlowLayout，重写layoutAttributesForElements(in rect:CGRect)方法
UICollectionViewFlowLayout.h文件：
@interface New_DictionUICollectionViewLeftFlowLayout : UICollectionViewFlowLayout
@end
UICollectionViewFlowLayout.m文件：
#import "New_DictionUICollectionViewLeftFlowLayout.h"
@implementation New_DictionUICollectionViewLeftFlowLayout
- (NSArray *)layoutAttributesForElementsInRect:(CGRect) rect {
NSMutableArray *attributes = [[super layoutAttributesForElementsInRect:rect] mutableCopy];
for (UICollectionViewLayoutAttributes *attr in attributes) {
// 每个cell的frame
NSLog(@"😆😆 = %@", NSStringFromCGRect([attr frame]));
/*
数组后发现数据还是有间隔，
然后确定思路，将里面的数据进行更改就实现了紧密排版
贴上代码：
2021-10-14 17:42:17.788922+0800 km[6277:377641] 😆😆 = {{15, 5}, {115, 32}}
2021-10-14 17:42:26.627243+0800 km[6277:377641] 😆😆 = {{197, 5}, {163, 32}}
2021-10-14 17:42:26.627660+0800 km[6277:377641] 😆😆 = {{15, 47}, {138, 32}}
2021-10-14 17:42:26.627932+0800 km[6277:377641] 😆😆 = {{189.5, 47}, {86, 32}}
2021-10-14 17:42:26.628892+0800 km[6277:377641] 😆😆 = {{312, 47}, {48, 32}}
2021-10-14 17:42:26.629597+0800 km[6277:377641] 😆😆 = {{15, 89}, {92, 32}}
2021-10-14 17:42:26.630260+0800 km[6277:377641] 😆😆 = {{117, 89}, {90, 32}}
*/
}
for (UICollectionViewLayoutAttributes *attr in attributes) {
NSLog(@"%@", NSStringFromCGRect([attr frame]));
}
/// 下面代码，设置后，就会实现自己想要的结果了：
//从第二个循环到最后一个
for(int i = 1; i < [attributes count]; ++i) {
//当前attributes
UICollectionViewLayoutAttributes *currentLayoutAttributes = attributes[i];
//上一个attributes
UICollectionViewLayoutAttributes *prevLayoutAttributes = attributes[i - 1];
//我们想设置的最大间距，可根据需要改
NSInteger maximumSpacing = [UIScreen mainScreen].bounds.size.width/375*10;
//前一个cell的最右边
NSInteger origin = CGRectGetMaxX(prevLayoutAttributes.frame);
//如果当前一个cell的最右边加上我们想要的间距加上当前cell的宽度依然在contentSize中，我们改变当前cell的原点位置
//不加这个判断的后果是，UICollectionView只显示一行，原因是下面所有cell的x值都被加到第一行最后一个元素的后面了
if(origin + maximumSpacing + currentLayoutAttributes.frame.size.width < self.collectionViewContentSize.width) {
CGRect frame = currentLayoutAttributes.frame;
frame.origin.x = origin + maximumSpacing;
currentLayoutAttributes.frame = frame;
}
/*
/// 注意：（当前的cell宽度要加上当前这个cell右边的间隔后，再判断是否一行是否能放开，+ [UIScreen mainScreen].bounds.size.width/375*10）
//如果当前一个cell的最右边加上我们想要的间距加上当前cell的宽度依然在contentSize中，我们改变当前cell的原点位置（当前的cell宽度要加上当前这个cell右边的间隔）
//不加这个判断的后果是，UICollectionView只显示一行，原因是下面所有cell的x值都被加到第一行最后一个元素的后面了
if(origin + maximumSpacing + currentLayoutAttributes.frame.size.width + [UIScreen mainScreen].bounds.size.width/375*10 < self.collectionViewContentSize.width) {
CGRect frame = currentLayoutAttributes.frame;
frame.origin.x = origin + maximumSpacing;
currentLayoutAttributes.frame = frame;
}
*/
}
return attributes;
return [attributes copy];
}
@end
- 2、使用：
- (void)setupUI {
// UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
/// 重写一个继承自UICollectionViewFlowLayout类的子类：
New_DictionUICollectionViewLeftFlowLayout *layout = [[New_DictionUICollectionViewLeftFlowLayout alloc] init];
layout.scrollDirection = UICollectionViewScrollDirectionVertical;
layout.sectionHeadersPinToVisibleBounds = NO;
layout.sectionFootersPinToVisibleBounds = NO;
UICollectionView *collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
collectionView.backgroundColor = [UIColor whiteColor];
collectionView.delegate = self;
collectionView.dataSource = self;
collectionView.showsVerticalScrollIndicator = NO;
collectionView.scrollEnabled = NO;
[self addSubview:collectionView];
[collectionView makeConstraints:^(MASConstraintMaker *make) {
//make.edges.equalTo(self);
make.top.bottom.equalTo(self);
make.left.mas_equalTo(self.mas_left).offset([UIScreen mainScreen].bounds.size.width/375*15);
make.right.mas_equalTo(self.mas_right).offset(-[UIScreen mainScreen].bounds.size.width/375*14);
}];
[collectionView registerClass:[N_DictionaryPanelRecordCell class] forCellWithReuseIdentifier:NSStringFromClass([N_DictionaryPanelRecordCell class])];
self.collectionView = collectionView;
}
- (void)refreshCollectionView {
[self.collectionView reloadData];
}
#pragma mark -- <UICollectionViewDelegate>
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return self.searchArray.count;
}
-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
CGFloat width = 0;
CGFloat height = 0;
if (self.searchArray.count > 0) {
// 根据字符串的长度，来设置宽度
NSString *itemString = [NSString stringWithFormat:@"%@", self.searchArray[indexPath.row][@"word"]];
if (itemString.length > 0 && ![itemString isEqualToString:@"(null)"] && ![itemString isEqualToString:@"<null>"]) {
//（单行文本）
CGSize size = [itemString sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:[UIScreen mainScreen].bounds.size.width/375*15 weight:UIFontWeightRegular]}];
width = ceil(size.width) + [UIScreen mainScreen].bounds.size.width/375*(10 + 5 + 13 + 10); // ceil 如果参数是小数，则求最小的证书但不小于本身
height = ceil(size.height);
}
if (width > [UIScreen mainScreen].bounds.size.width/375*335) {
width = [UIScreen mainScreen].bounds.size.width/375*335;
}
}
return CGSizeMake(width, [UIScreen mainScreen].bounds.size.width/375*32);
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
// 水平上下
return [UIScreen mainScreen].bounds.size.width/375*10;
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
// 垂直左右
return [UIScreen mainScreen].bounds.size.width/375*10;
}
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
// section 边界
return UIEdgeInsetsMake([UIScreen mainScreen].bounds.size.width/375*5, [UIScreen mainScreen].bounds.size.width/375*15, [UIScreen mainScreen].bounds.size.width/375*5, [UIScreen mainScreen].bounds.size.width/375*15);
}
- (nonnull __kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
N_DictionaryPanelRecordCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([N_DictionaryPanelRecordCell class]) forIndexPath:indexPath];
if (self.searchArray.count > 0) {
cell.itemDic = self.searchArray[indexPath.row];
}
__weak typeof(self) weakSelf = self;
cell.deleteAloneWordRecordBlock = ^(BOOL isDeleteWordRecord) {
if (isDeleteWordRecord) {
NSMutableArray *recordArr = [NSMutableArray arrayWithCapacity:0];
recordArr = [weakSelf.searchArray mutableCopy];
[recordArr removeObject:[NSString stringWithFormat:@"%@", weakSelf.searchArray[indexPath.row]]];
weakSelf.searchArray = [recordArr copy];
[[NSUserDefaults standardUserDefaults] setObject:weakSelf.searchArray forKey:@"dictionary"];
[[NSUserDefaults standardUserDefaults] synchronize];
[weakSelf.collectionView reloadData];
}
};
return cell;
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
N_DictionaryPanelRecordCell *cell = (N_DictionaryPanelRecordCell *)[collectionView cellForItemAtIndexPath:indexPath];
NSDictionary *dic = [self.searchArray objectAtIndex:indexPath.row];
NSString *word = [NSString stringWithFormat:@"%@",[dic valueForKey:@"word"]];
if ([word isChinese])
{
}
else
{
}
}
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