UICollectionView 滚动不流畅.为什么? [英] UICollectionView scrolling is not smooth. Why?

问题描述

为什么我的 UICollecionView 滚动不流畅?

Why my UICollecionView's scrolling is not smooth?

这是代码:

static NSString *CellIdentifier = @"cellRecipe";

// Configure the cell...

[cell setBackgroundColor: [UIColor colorWithPatternImage:[UIImage imageNamed:@"bgRecipeCell.png"]]];

cell.image.layer.masksToBounds = YES;
cell.image.layer.cornerRadius = 8.0f;
cell.image.layer.borderColor = [UIColor blackColor].CGColor;
cell.image.layer.borderWidth = 1.0f;

Recipes *recipe = [recipesArray_ objectAtIndex:indexPath.item];

//checking for purchase
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSObject *object = [prefs objectForKey:@"com.__.__.recipefree"];

if ([recipe.isPaid integerValue] == 0) {
    [cell.freeImage setHidden:NO];
}
else [cell.freeImage setHidden:YES];

if ([object isEqual:[NSNumber numberWithInt:1]]) {
    [cell.freeImage setHidden:YES];
}

if ([recipe.isFavorite integerValue] == 0) {
    [cell.favImage setImage:[UIImage imageNamed:@"toFavorite.png"] ];
}
else [cell.favImage setImage: [UIImage imageNamed:@"toFavorite_.png"]];

[cell.recipeName setText: recipe.name];
[cell.image setImage:recipe.thumbImage];

MainTabController *mainTabController = [[MainTabController alloc] init];
int difficulty = [recipe.difficulty intValue];
//this is the function which return an image for difficulty level from 1 to 5
[cell.difficultyImage setImage: [mainTabController imageForRating:difficulty]];

return cell;

推荐答案

这是一个老问题，但如果有人仍在寻找答案，那么一个简短的技巧将是，在 cellForItemAtIndexPath 中，首先 dequeue 你的 collectionView 单元格:

It's an old question, but in case if anyone still looking for answer then a short trick will be, in cellForItemAtIndexPath, first dequeue your collectionView cell :

CustomCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];

然后添加以下行:

cell.layer.shouldRasterize = YES;cell.layer.rasterizationScale = [UIScreen mainScreen].scale;

这篇关于UICollectionView 滚动不流畅.为什么?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！