小编Ale*_*erZ的帖子

在加载集合视图之前,用户设置集合视图数组中的图像数.所有细胞都不适合屏幕.我有30个单元格,屏幕上只有6个单元格.

问题:如何在UICollectionView的加载下自动滚动到具有所需图像的单元格？

我正在尝试在我的CoreData实体食谱中准备多个搜索.有一些参数,我想准备提取.

食谱属性:

@property (nonatomic, retain) NSNumber * difficulty;
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSNumber * code; //like identifier
@property (nonatomic, retain) NSNumber * prepTime;

成分是一个单独的实体与成分列表.

Join实体包含ingredientCode,recipeCode,count.

getArrayOfJoinDataWithIngredients获取连接实体并返回包含一些输入成分的配方代码的NSArray .

这是我的代码:

- (IBAction)callRecipeFetch:(id)sender
{
    NSString *predicateString = @"";

    NSArray *codes = [[NSArray alloc] init]; codes = nil;
    if ([paramController.ingredientsForSearchArray count] > 0) {
        NSMutableArray *ingredientsArray = [[NSMutableArray alloc] init];
        for (Ingredients *ingredient …

我想在目标C中以编程方式在我的应用程序Documents文件夹中创建plist文件.我在文档目录中创建一个文件夹:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];
NSString *path = [NSString stringWithFormat:@"%@/Data.plist", documentsDirectoryPath];

我正在尝试创建一个看起来像XML文件的plist文件./****必需的XML文件****/

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
<dict>
    <key>height</key>
    <integer>4007</integer>
    <key>name</key>
    <string>map</string>
    <key>width</key>
    <integer>6008</integer>
</dict>
</array>
</plist>

/****通过代码****/获得文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"  "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>height</key>
    <string>4007</string>
    <key>name</key>
    <string>map</string>
    <key>width</key>
    <string>6008</string>
</dict>
</plist>

所需文件需要一个数组,在数组中我们有一个字典对象.我怎么能改变这个？我也知道如何将文件写入路径,但主要问题是如何创建plist文件然后读取它？

我有一个横向UIScrollView分页.有两个按钮.一个向左滚动scrollView到另一个向右.

左边的代码:

- (IBAction)goLeftAction:(id)sender
{
    CGFloat pageWidth = _theScrollView.frame.size.width;
    int page = floor((_theScrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
    if(page>0){
        page -=1;
        [_theScrollView scrollRectToVisible:CGRectMake(_theScrollView.frame.size.width*page, 0, self.view.frame.size.width, self.view.frame.size.height) animated:YES];
    }
}

scrollView当我们在第一页(页面= 0)并按下左键时,我希望按钮使显示弹跳效果.

请帮助找到实现这一目标的方法.

编辑:

如果有人需要,这是代码.

首先我加入了 goLeftAction:

[_theScrollView setPagingEnabled:NO];
[_theScrollView setScrollEnabled:NO];
[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(bounceScrollView) userInfo:nil repeats:NO];

接下来:

- (void)bounceScrollView
{
    [self.theScrollView scrollRectToVisible:CGRectMake(100, 0, self.view.frame.size.width, self.view.frame.size.height) animated:YES];
    [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(unbounceScrollView) userInfo:nil repeats:NO];
}
- (void)unbounceScrollView
{
    [self.theScrollView scrollRectToVisible:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) animated:YES]; …