objective-c

问题 OK basically I have a class in an iPhone app where I want it to some read only propertys. Meaning that the owning class can read and write the property, but other objects can only read it. I try the "readonly" option when I declare the property, but then my class can't even write it. What use is that? 回答1: If it's not too inconvenient, just use the ivar or "backing" variable in your class to modify the value. Like this: In your .h file: @interface ClassName @property (readonly,nonatomic)

问题 OK basically I have a class in an iPhone app where I want it to some read only propertys. Meaning that the owning class can read and write the property, but other objects can only read it. I try the "readonly" option when I declare the property, but then my class can't even write it. What use is that? 回答1: If it's not too inconvenient, just use the ivar or "backing" variable in your class to modify the value. Like this: In your .h file: @interface ClassName @property (readonly,nonatomic)

问题 I would like to detect the presence of unsecured wifi network in my app. Is there any public iOS API available to achieve the same? 回答1: There is no documented API to get that information. If you application needs to send and receive sensitive data across the network, you should generally assume that no connection is secured. 回答2: I would suggest you use an SSL connection for your web service. Then the data that leaves will be encrypted. 回答3: Have a look at the stumbler application and in

问题 I would like to detect the presence of unsecured wifi network in my app. Is there any public iOS API available to achieve the same? 回答1: There is no documented API to get that information. If you application needs to send and receive sensitive data across the network, you should generally assume that no connection is secured. 回答2: I would suggest you use an SSL connection for your web service. Then the data that leaves will be encrypted. 回答3: Have a look at the stumbler application and in

问题 I am trying to make an arrow which have two side arrow mark and in middle arc curve But Now i have used mayOff_gist and able to make single line arrow with one side . code- //.h @interface UIBezierPath (arrow) + (UIBezierPath *)dqd_bezierPathWithArrowFromPoint:(CGPoint)startPoint toPoint:(CGPoint)endPoint tailWidth:(CGFloat)tailWidth headWidth:(CGFloat)headWidth headLength:(CGFloat)headLength; @end //.m #define kArrowPointCount 7 @implementation UIBezierPath (arrow) + (UIBezierPath *)dqd

问题 I am trying to make an arrow which have two side arrow mark and in middle arc curve But Now i have used mayOff_gist and able to make single line arrow with one side . code- //.h @interface UIBezierPath (arrow) + (UIBezierPath *)dqd_bezierPathWithArrowFromPoint:(CGPoint)startPoint toPoint:(CGPoint)endPoint tailWidth:(CGFloat)tailWidth headWidth:(CGFloat)headWidth headLength:(CGFloat)headLength; @end //.m #define kArrowPointCount 7 @implementation UIBezierPath (arrow) + (UIBezierPath *)dqd

问题 I want to add a pickerview instead of a keyboard for a specific textfield and fill the picker view with content directly in the .m file What is the easiest way to accomplish that? Can I do this directly in the interface builder or do i have to add much code on my own? 回答1: For any Xamarin.iOS developers, here's how to do it in C# public partial class MyViewController : UIViewController { public override void ViewDidLoad() { base.ViewDidLoad(); ConfigurePicker(); } void ConfigurePicker() { var

问题 I want to add a pickerview instead of a keyboard for a specific textfield and fill the picker view with content directly in the .m file What is the easiest way to accomplish that? Can I do this directly in the interface builder or do i have to add much code on my own? 回答1: For any Xamarin.iOS developers, here's how to do it in C# public partial class MyViewController : UIViewController { public override void ViewDidLoad() { base.ViewDidLoad(); ConfigurePicker(); } void ConfigurePicker() { var

问题 I have created my own tabbarcontroller of sorts, but am having an issue with animation. When I animate the views on tab click, the navigation bar turns completely black (should be red), then blinks back to red after the animation completes. My setup and code is below. (Answers in either swift or objective-c are helpful since the tranlastion is easy) Thanks in advance! red: Navigation Bar blue: Navigation Display View grey: Tab Bar burgundy: Tab Bar Display View (This is the part being

问题 Basically, I have an NSString of 46 characters which i convert to NSData. I need to pad the string to 48 characters. It does not work via just adding ' ' to the end of the NSString. So, i just increased the length of NSData using this: NSString *string = @"__46characterlongstring__"; NSData *d = [string dataUsingEncoding:NSUTF8StringEncoding]; NSLog(@"d: %@", d); NSData *data = [NSData dataWithBytes:[d bytes] length:48]; NSLog(@"data: %@", data); The NSData called 'd' returns <723d6c67