Recent questions tagged Objective

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objective c - Why is [@"" class] != NSClassFromString(NSStringFromClass([@"" class])) on OS X?

if([@"" class] == NSClassFromString(NSStringFromClass([@"" class]))) printf("foo"); else printf("bar"); ... behaving that strange on OS X? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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950 views

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objective c - List/Search all existing UTIs (Uniform Type Identifiers)

Is it possible to find a list of all existing Uniform Type Identifiers on a system? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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842 views

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objective c - Downloading HTML string into an NSString or Swift String variable in iOS

Alternative titles How to download a web page data in Objective-C on iPhone? How to read entire content of an html ... "html my web page html". See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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581 views

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objective c - Core Data migration problem: "Persistent store migration failed, missing source managed object model."

The Background A Cocoa Non Document Core Data project with two Managed Object Models. Model 1 stays the same. Model ... m not seeing. Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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639 views

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objective c - UIAlertView crashs in iOS 8.3

recently i start receiving crash reports for UIAlertView only by users that use iOS 8.3 Crashlytics reports: Fatal ... has fixed the problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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503 views

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objective c - How to programmatically check the iPad version/model

Is there a method to check the version/model of an iPad (i.e iPad 1/2/3). I am using some transparency in ... model number in the code as well. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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665 views

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objective c - NSString by removing the initial zeros?

How can I remove leading zeros from an NSString? e.g. I have: NSString *myString; with values such as @"0002060" ... "236" and @"21456". Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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548 views

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objective c - Does cocos2d support ARC?

I am using Xcode 4.2 and building a game for iphone (from iOS 3.0 - 5.0). Does cocos2d support ARC? What ... compiler to 3.0 to support ARC? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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678 views

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objective c - NSTextField enter to trigger action

I've been looking all over for a simple example of how to have an action (or button) be triggered when the ... that would be great. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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551 views

1 answer

objective c - Parse NSURL path and query on iOS

Are there any standard objects or functions to parse an NSURL's components? Clearly I could write one, but ... has different functions on macOS. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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739 views

1 answer

objective c - [UITapGestureRecognizer tag]: unrecognized selector sent to instance

I am having a series of imageview arranged, and assigning a TapView recognizer to it UITapGestureRecognizer * ... sent to instance 0x145d0210 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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621 views

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objective c - Core Data delete rule -- to-many relationship, delete when empty

I'm a little fuzzy on how the delete rules for relationships in Core Data work, at least beyond the simple ... handle this kind of situation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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675 views

1 answer

objective c - Infinite UIScrollView

I would like to implement a timeline, much like one you can find in iMovie or Final Cut, which you can ... works really bad and feels wrong. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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622 views

1 answer

objective c - How to detect shake motion in iPhone

On the shake of the iPhone device i want some function to be called, i dont know how to recognize shake so ... do the same Thanks and Regards See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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508 views

1 answer

objective c - When should I use Strong vs Weak for IBOutlets (further clarification)

I thought I understood it clearly from this question --> Should IBOutlets be strong or weak under ARC? but I ... has one view which it owns. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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630 views

1 answer

objective c - Using a delegate to pass data back up the navigation stack

I have been battling with passing data between two view controllers for a couple of days now and getting very ... . Thanks in advance Matt See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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833 views

1 answer

objective c - NSString boundingRectWithSize slightly underestimating the correct height - why?

I'm attempting to resize a text field / view automatically depending on its current width. In other words ... resize bounds / frame? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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715 views

1 answer

objective c - how to add object to NSMutableArray

I am trying to read an input file (if it exists) and then want to add a string to that input. My code ... when the input file does not exist. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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473 views

1 answer

objective c - Calculating the max value for a core data attribute - NSCFNumber error

I need to find out the maximum value of an attribute of a core data entity. I'm still firmly in the Cocoa ... a lot of Googling. Thanks Darren. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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593 views

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objective c - In ARC do we need to send removeObserver: explicitly?

Do we have to send removeObserver: explicitly for objects that have been added as observers to an ... implicitly in class/application? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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617 views

1 answer

objective c - Receiving 2 KVO notifications for a single KVC change

I'm using KVC/KVO to create a custom bindings implementation for a University project (it needs to be custom ... the same arguments each time. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

535 views

1 answer

objective c - Xcode 4 and BWToolKit

Can we use BWToolKit or any other IB plug-ins in Xcode 4? My old project uses the BWToolKit and now I can't open it without Interface Builder. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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737 views

1 answer

objective c - How do I launch an application on system startup? (Mac OSX, Cocoa)

I have a program that runs only in the toolbar (w/ time/date, spotlight, etc.) and I want to put an ... be much appreciated. Thanks in advance! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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588 views

1 answer

objective c - Accessing a method in a super class when it's not exposed

In a subclass, I'm overriding a method that is not exposed in the super class. I know that I have the correct ... around what I'm trying to do. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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694 views

1 answer

objective c - iOS CoreBluetooth : centralManager:didConnectPeripheral / didFailToConnectPeripheral: not getting called

I'm pulling my hair out of this problems. I'm trying to connect to BLE devices, can't see what I've ... now. Appreciate every helps, thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

572 views

1 answer

objective c - iPhone sdk - open app store to specific app?

Is there a way to open the app store to a specific application? I tried using something like the following: ... to many redirects occurred". See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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981 views

1 answer

objective c - UIFont fontWithName returns nil

In my info.plist, I added a key "Fonts provided by application" and added EdwardianScriptITCStd.otf But, when I ... What am I missing? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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769 views

1 answer

objective c - What is the NSObject isEqual: and hash default function?

I have a database model class that is a NSObject. I have a set of these objects in a NSMutableArray. I use ... did not solve my initial problem. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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