小编Wri*_*sCS的帖子

我想对UIImageView缩放,旋转进行2次操作,我有2个问题:

答:我为ex做了缩放操作.当我尝试进行旋转时,将UIImageView其设置为初始大小,我想知道如何保持缩放UIImageView并从缩放图像进行旋转.

B.我想将缩放操作与旋转相结合,我不知道如何实现这一点:

- (void)viewDidLoad 
{
    foo = [[UIImageView alloc]initWithFrame:CGRectMake(100.0, 100.0, 600, 800.0)];
    foo.userInteractionEnabled = YES;
    foo.multipleTouchEnabled  = YES;
    foo.image = [UIImage imageNamed:@"earth.jpg"];
    foo.contentMode = UIViewContentModeScaleAspectFit;
    foo.clipsToBounds = YES;

    [self.view addSubview:foo];
}

//---pinch gesture--- 
UIPinchGestureRecognizer *pinchGesture =
[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinchGesture:)];
[foo addGestureRecognizer:pinchGesture]; 
[pinchGesture release];

//---rotate gesture--- 
UIRotationGestureRecognizer *rotateGesture =
[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(handleRotateGesture:)];
[foo addGestureRecognizer:rotateGesture]; 
[rotateGesture release];

//---handle pinch gesture--- 
-(IBAction) handlePinchGesture:(UIGestureRecognizer *) sender {
    NSLog(@"Pinch");
    CGFloat factor = [(UIPinchGestureRecognizer *) …

有没有办法编辑Xcode的内置代码片段？有一个编辑按钮,但按下它似乎不允许更改片段的文本.

任何见解都表示赞赏.

我正在使用带有剪切的透明图像,以便用户插入/拍摄自己的图像.出于某种原因,在使用UIImagePickerControllerEditedImage和裁剪用户拍摄的照片时,图像不会像编辑时那样保存; 比如看照片.

我的问题是图像没有准确保存照片的编辑方式.(即:裁剪/调整大小).

设置UIImagePicker

-(void)choosePhotoDialog:(id)sender
{        
    OverlayView * overlay = [[OverlayView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH_IPHONE, SCREEN_HEIGTH_IPHONE) andPhoto:[dict objectForKey:@"imageUrl"]];
    [overlay setUserInteractionEnabled: NO];

    UIImagePickerController * picker = [[UIImagePickerController alloc] init];
    [picker setSourceType: UIImagePickerControllerSourceTypeCamera];
    [picker setDelegate: self];
    [picker setAllowsImageEditing: YES];
    [picker setShowsCameraControls: YES];
    [picker setNavigationBarHidden: YES];
    [picker setWantsFullScreenLayout: YES];
    [picker setCameraOverlayView: overlay];
    [self presentModalViewController:picker animated:YES];  
    [picker release];
}

编辑图像后:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    SDWebImageManager * manager = [SDWebImageManager sharedManager];
    UIImage * cachedImage  = [manager imageWithURL: [NSURL URLWithString: …

我正在尝试让我的表格视图记住它的最后位置,以便在应用程序再次运行后,它将滚动到该位置.要做到这一点,在我的viewWillDisappear:方法中,我得到第一个可见的行号并保存到NSUserDefaults.然后在我的viewDidAppear中我尝试通过发送scrollToRowAtIndexPath到表视图滚动到该行.但是我得到了NSRangeException:

*** Terminating app due to uncaught exception 'NSRangeException', reason: '-[UITableView scrollToRowAtIndexPath:atScrollPosition:animated:]: section (0) beyond bounds (0).

任何帮助赞赏.这是代码:

- (void)viewDidAppear:(BOOL)animated
{
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

    if ([userDefaults valueForKey:@"content_row"] != nil)
    {
        int rowToHighlight = [[userDefaults valueForKey:@"content_row"] intValue];
        NSIndexPath * ndxPath= [NSIndexPath indexPathForRow:rowToHighlight inSection:0];
        [contentTableView scrollToRowAtIndexPath:ndxPath atScrollPosition:UITableViewScrollPositionTop  animated:YES];
    }
}

-(void) viewWillDisappear:(BOOL)animated
{
    NSIndexPath *selectedRowPath = [[contentTableView indexPathsForVisibleRows] objectAtIndex:0];
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    [userDefaults setInteger:selectedRowPath.row forKey:@"content_row"];
}

这是toggleAddProject方法的代码,Core Data代码与Apple的CoreDataBooks示例中的代码几乎相同,但是当我单击添加按钮时,应用程序崩溃entityForName: could not locate an NSManagedObjectModel for entity name 'Project'就行了newProjectController.project

-(IBAction)toggleAddProject 
{
    NewProjectViewController *newProjectController = [[[NewProjectViewController alloc] initWithStyle:UITableViewStyleGrouped] autorelease];

    // Create a new managed object context for the new project -- set its persistent store coordinator to the same as that from the fetched results controller's context.
    NSManagedObjectContext *addingContext = [[NSManagedObjectContext alloc] init];
    self.addingManagedObjectContext = addingContext;
    [addingManagedObjectContext setPersistentStoreCoordinator:[[fetchedResultsController managedObjectContext] persistentStoreCoordinator]];
    newProjectController.project = (Project *)[NSEntityDescription insertNewObjectForEntityForName:@"Project" inManagedObjectContext:addingContext];
    [addingContext release];


    UINavigationController *addNewNavigationController = [[UINavigationController alloc] initWithRootViewController:newProjectController];
    [self.navigationController presentModalViewController:addNewNavigationController …

我有一个带UISearchBar的UIViewController.我已通过完成按钮替换了搜索按钮.

但是,当单击搜索栏时,最初会禁用"完成"按钮.这会发生,直到一个人输入任何字符

我想要做的是始终启用此完成按钮,这样如果我点击它我可以立即关闭键盘.

有帮助吗？非常感谢.

我有我的UIViewController

-(BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar  
{   
    return YES;  
}  

-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
    [searchBar resignFirstResponder];
}  

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText  
{  
    if (searchBar.text.length == 0)  
    {  
        //[self fixOrientation];  
        [searchBar resignFirstResponder];  
    }   
    else  
    {  
        NSLog(@"typed");  
    }  
}  


-(void)searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar  
{  
    NSLog(@"began");  // this executes as soon as i tap on the searchbar, so I'm guessing this is the place to put whatever solution is available  
}  

我Property 'aVariable' not found on object of type id在尝试读取或写入数组的变量时得到了.不应该知道我添加的对象是什么类？还注意到它用于读取值NSLog(@" %@",[[anArray objectAtIndex:0] aVariable]);

我是Objective C的初学者,所以我可能会遇到一些简单的事情.

一个东西

@interface AnObject : NSObject

@property (nonatomic,readwrite) int aVariable;

@end

AnotherObject

@interface AnotherObject : NSObject

@end

test.h

#import "test.h"

@implementation AnObject
@synthesize aVariable;

- (id)init
{
    self = [super init];
    if (self) {
        aVariable=0;
    }
    return self;
}  

@end

test.m

@implementation AnotherObject

- (id)init
{
    self = [super init];
    if (self) { }
    return self;
}  

- (NSMutableArray*) addToArray
{
    NSMutableArray* anArray = …

我们有一个可绑定的(当我们连接时,我们被要求配对,请参阅问题2)我们制造并编写了iOS应用程序的蓝牙4.0外围设备.

问题1

在具有CoreBluetooth的iOS 6中是否可以从我们的应用程序中删除iOS蓝牙设置中的外围设备,或仅限于进入iOS设置/蓝牙/我们的外围设备和"忘记此设备".

我们要做的是当我们从应用程序中删除外围设备时,我们希望此外围设备也可以从iOS蓝牙列表中删除.

问题2

我的第二个问题是,iOS SDK是否提供了一种方法来确定用户是否在配对请求警报中选择了"配对"或"取消"？截至目前,我们通过在连接设备时读取我们的服务/特征来确定用户按下的对.

我已使用以下代码从图像成功创建了视频

-(void)writeImageAsMovie:(NSArray *)array toPath:(NSString*)path size:(CGSize)size duration:(int)duration 
{
    NSError *error = nil;
    AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
                                  [NSURL fileURLWithPath:path] fileType:AVFileTypeQuickTimeMovie
                                                              error:&error];
    NSParameterAssert(videoWriter);

    NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                   AVVideoCodecH264, AVVideoCodecKey,
                                   [NSNumber numberWithInt:size.width], AVVideoWidthKey,
                                   [NSNumber numberWithInt:size.height], AVVideoHeightKey,
                                   nil];
    AVAssetWriterInput* writerInput = [[AVAssetWriterInput
                                        assetWriterInputWithMediaType:AVMediaTypeVideo
                                        outputSettings:videoSettings] retain];

    AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
                                                     assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput
                                                     sourcePixelBufferAttributes:nil];
    NSParameterAssert(writerInput);
    NSParameterAssert([videoWriter canAddInput:writerInput]);
    [videoWriter addInput:writerInput];


    //Start a session:
    [videoWriter startWriting];
    [videoWriter startSessionAtSourceTime:kCMTimeZero];

    CVPixelBufferRef buffer = NULL;
    buffer = [self pixelBufferFromCGImage:[[array objectAtIndex:0] CGImage]];
    [adaptor appendPixelBuffer:buffer withPresentationTime:kCMTimeZero];

    //Write samples:
    for (int i = …

在进入下一行代码之前,如何让我的程序等待异步NSURLConnection完成？

SetDelegate *sjd= [SetDelegate alloc];
NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:post delegate:sjd];
[connection start];

这是我开始连接的方式,我处理委托中收到的数据,但我想等待连接结束,然后继续主要是因为这是在for循环中,它必须为我的数据库中的每个元素运行.

我需要将数据从手机数据库放到远程数据库中,并在数据成功放入手机数据库中的数据后删除.我正在浏览手机数据库中的每个元素并开始连接,这就是为什么我不知道如何从循环中完成下一个操作.当谈到Objective-c编程时,我是初学者,所以我不确定这是否是正确的方法

使调用同步不是一个选项,因为它会阻止程序,我有一个应该显示的进度条.