小编Sha*_* TK的帖子

我收到一个错误,因为"没有更多上下文,表达的类型是模糊的"

这是我的代码

@IBOutlet var customerDashboardButtons:[NSArray]?

var predicate = NSPredicate(format: "SELF.tag == %d", tag)
var filteredButtons = customerDashboardButtons!.filter { predicate.evaluateWithObject($0) };
if 0 < filteredButtons.count {
      var button = customerDashboardButtons!.first
      button.hidden = true // getting an error in this line as "Type of expression is ambiguous without more context
 }

我试过以下,

var button:UIButton = customerDashboardButtons!.first //Error "NSArray? is not convertible to UIButton"

var button = customerDashboardButtons!.first as UIButton //Error "NSArray? is not convertible to UIButton"

对此有任何帮助表示赞赏.

我已经从 developer.Apple 网站下载了示例代码GLPaint，以使用 OpenGL 在 Canvas 上绘制图片。

我对 GLPaint 应用程序进行了许多更改以满足我的要求。现在，我想将绘制的项目作为图像保存到照片库中。

我知道在照片库中保存图像的方法。所以，我尝试在绘制图片后创建相应的图像文件。你知道这样做的好方法是什么吗？对此的任何帮助表示高度赞赏。

代码细节描述如下。

绘画视图.h

EAGLContext *context;

// OpenGL names for the renderbuffer and framebuffers used to render to this view
GLuint viewRenderbuffer, viewFramebuffer;

// OpenGL name for the depth buffer that is attached to viewFramebuffer, if it exists (0 if it does not exist)
GLuint depthRenderbuffer;

GLuint    brushTexture;
CGPoint    location;
CGPoint    previousLocation;

PaintView.m

// Handles the start of a touch
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGRect                bounds = …

我从developer.Apple网站下载了示例代码GLPaint,使用OpenGL在Canvas上绘制图片.

我已经完成了GLPaint应用程序中的更改以满足我的要求.

现在我需要将绘图记录为m4v视频文件,该文件应该集成我在绘制图像时说出的口头指令.

例如:

• 点击"绘制和录制"按钮后,我开始画一个圆圈并说出"这是一个圆圈".

• 单击完成按钮后,结果应为包含绘图操作的视频文件,其中包含"这是一个圆圈"的声音

我研究了这个主题,但我没有找到任何好的方法来完成这个功能.

码:

PaintingView.h EAGLContext*context;

// OpenGL names for the renderbuffer and framebuffers used to render to this view
GLuint viewRenderbuffer, viewFramebuffer;

// OpenGL name for the depth buffer that is attached to viewFramebuffer, if it exists (0 if it does not exist)
GLuint depthRenderbuffer;

GLuint    brushTexture;
CGPoint    location;
CGPoint    previousLocation;

PaintingView.m

// Handles the start of a touch
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGRect                bounds = [self bounds];
    UITouch*    touch = [[event touchesForView:self] …

我的目标是当我点击已经选择的段时再次触发 UIControlEventValueChanged委托.

所以我已经提到了以下链接

uisegmentedcontrol寄存器抽头上选择的段

保持选择功能于uisegmentedcontrol

根据链接,我创建了一个uisegmentedcontrol子类,实现了该- (void) setSelectedSegmentIndex:(NSInteger)toValue {方法并编写了代码(来自上面的链接).

它与Ipad1配合得很好.但是,当点击已经选择的段时,继承/子类中的setSelectedSegmentIndex不会在Ipad2中触发!但是,当我点击未选择的段索引时,它工作正常.

我完成的代码如下

主类

ReselectableSegmentControl *firstNextSegmentedControl = [[ReselectableSegmentControl alloc] init];
firstNextSegmentedControl.frame = CGRectMake(xCordinate, 255, 188, 50);
firstNextSegmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
firstNextSegmentedControl.tag = index + 1;      
[firstNextSegmentedControl addTarget:self action:@selector(firstNextThenSegmentedControlValueChanged:) forControlEvents:UIControlEventValueChanged];
[firstNextSegmentedControl insertSegmentWithImage:[UIImage imageNamed:@"NoTimerCounter.png"] atIndex:0 animated:YES];
[firstNextSegmentedControl insertSegmentWithImage:[UIImage imageNamed:@"Timer.png"] atIndex:1 animated:YES];
[firstNextSegmentedControl insertSegmentWithImage:[UIImage imageNamed:@"Counter.png"] atIndex:2 animated:YES];              
firstNextSegmentedControl.selectedSegmentIndex = 0;

[self.view addSubview:firstNextSegmentedControl];
[firstNextSegmentedControl release];
firstNextSegmentedControl = nil;

UISegmentSubClass .h文件

#import <Foundation/Foundation.h>

@interface ReselectableSegmentControl : UISegmentedControl {    

}

@end

UISegmentSubClass .m文件

-(void)setSelectedSegmentIndex:(NSInteger …