UICollectionViewCell间距

 CalenderCollectionViewFlowLayout *flowLayout = [[CalenderCollectionViewFlowLayout alloc] init];
    flowLayout.minimumLineSpacing = 0;
    flowLayout.minimumInteritemSpacing = 0;
    flowLayout.itemSize = CGSizeMake(App_Frame_Width/7, App_Frame_Width/7*1.064);
//    NSInteger week = _date.weekday;
    float fws = 0.827;
    self.collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, App_Frame_Width, App_Frame_Width*fws) collectionViewLayout:flowLayout];
    self.collectionView.backgroundColor = [UIColor whiteColor];

　　

 

#import "CalenderCollectionViewFlowLayout.h"

@implementation CalenderCollectionViewFlowLayout

- (NSArray *) layoutAttributesForElementsInRect:(CGRect)rect {
    NSMutableArray * answer = [[super layoutAttributesForElementsInRect:rect] mutableCopy];
    
    /* 处理左右间距 */
    for(int i = 1; i < [answer count]; ++i) {
        UICollectionViewLayoutAttributes *currentLayoutAttributes = answer[i];
        UICollectionViewLayoutAttributes *prevLayoutAttributes = answer[i - 1];
        NSInteger maximumSpacing = 0;
        NSInteger origin = CGRectGetMaxX(prevLayoutAttributes.frame);
        
        if(origin + maximumSpacing + currentLayoutAttributes.frame.size.width < self.collectionViewContentSize.width) {
            CGRect frame = currentLayoutAttributes.frame;
            frame.origin.x = origin + maximumSpacing;
            currentLayoutAttributes.frame = frame;
        }
    }
    return answer;
}

@end