👀 Views: 2 💬 Answers: 1 📅 Created: 2025-06-05

objective-c nsattributedstring ios Objective-C

I'm reviewing some code and I'm working with an 'Invalid Argument' exception when trying to create an `NSAttributedString` with certain attributes in Objective-C... The code snippet below illustrates my approach: ```objective-c NSString *text = @"Hello, World!"; NSDictionary *attributes = @{ NSFontAttributeName: [UIFont systemFontOfSize:16], NSForegroundColorAttributeName: [UIColor blueColor], NSBackgroundColorAttributeName: [UIColor clearColor] }; NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:text attributes:attributes]; ``` I am specifically getting the exception when I call the initializer for `NSAttributedString`, and the behavior message states: `*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid parameter not satisfying: attributes != nil'`. I've double-checked that the `UIFont` and `UIColor` are not nil and they are correctly initialized. I also tried running this code on both iOS 14 and iOS 15 simulators to see if it was a version scenario, but the same exception continues. Additionally, I attempted to isolate the question by simplifying the attributes dictionary, and it seems to work fine without the background color attribute. Here’s the modified code that does not cause an exception: ```objective-c NSDictionary *attributes = @{ NSFontAttributeName: [UIFont systemFontOfSize:16], NSForegroundColorAttributeName: [UIColor blueColor] }; ``` Is there something specific about the `NSBackgroundColorAttributeName` that could be causing this scenario? Are there any best practices or common pitfalls I should be aware of when using `NSAttributedString` in this context? Any insights would be greatly appreciated! I'm working in a Windows 10 environment. Has anyone else encountered this?