cocoa-touch

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How to check that float property of managed object is nil?

Score is NSManagedObject. score.latit开发者_JAVA百科ude is an NSNumber, which actually is a float value.[详细]

2023-04-12 14:44 分类：问答
IOS: move an UIImageView

In my app I want to move a little UIImageView with inside a .png; this is a little insect and I want to simulate his flight. At example I want that this png do when it move an inverted eight as the in[详细]

2023-04-12 13:42 分类：问答
Validating receipt with App Store in sandbox mode

I\'m having some trouble testing my in app subscriptions. To know where to start I would like to know if a recepit can be validated (in sandbox mode of course) even if it\'s not approved by apple. I g[详细]

2023-04-12 13:31 分类：问答
How to add gesture recognizers to multiple buttons?

Hi, I am trying to add gesture recognizers to \'UIButton\'. When I do it like this: UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSing[详细]

2023-04-12 13:20 分类：问答
Missing sentinel in UIAlertView allocation

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@\"Error\" message:@\"Some failure message\" 开发者_C百科delegate:self[详细]

2023-04-12 13:02 分类：问答
Show middle of Image on iPhone - Cocoa

I am getting into a dilemma. I am trying to show the middle of an image. I use the the mageWithImage:CovertToSize function to scale the image. The problem is that the image is being stretched height w[详细]

2023-04-12 13:01 分类：问答
Why do CALayer's move slower than UIView's?

I have a UIView subclass that moved around \'event\'s when the user touches them, using the following overridden method:[详细]

2023-04-12 12:50 分类：问答
iphone App: Send Alert message when App is running in background?

In iPhone how can we send alert message when App is running in back开发者_运维技巧ground?When apps running on background you can\'t sent a UIAlert. Its Need UI to show a alert.[详细]

2023-04-12 12:24 分类：问答
How to detect touches on UIImageView of UITableViewCell object in the UITableViewCellStyleSubtitle style

I am using the UITableViewCell object in the UITableViewCellStyleSubtitle style (i.e an image view on the left, text label in bold and under that a detail text label) to create my table. Now I need t[详细]

2023-04-12 11:52 分类：问答
Blocking HDMI output of video

For legal reasons we need to prevent users from playing the video in our app on external screen (TV, monitors), I know how to stop airplay output but we need to stop HDMI output as well, does anybody[详细]

2023-04-12 11:02 分类：问答