Label on Limit Lines cause crash

[DarkInsight85]

ChartLimitLine *line1 = [[ChartLimitLine alloc] initWithLimit:40.6f];
This works fine,
however if I put a label on my limit lines like this
ChartLimitLine *line1 = [[ChartLimitLine alloc] initWithLimit:40.6f label:@"test"];

My app will crash at ChartUtils.swift drawText function. And my Xcode is subsequently shutdown.

[DarkInsight85]

P.S: My app supports iOS 7, so I dragged the swift files into my project instead of importing framework.

[liuxuan30]

You should really edit your stack trace, yours is loosing the focus. Paste only helpful log.
Your main thread stack trace seems irrelevant to drawText. It seems crashes at a very early phase？

Thread 0:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff9138a4de mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff9138964f mach_msg + 55
2 com.apple.CoreGraphics 0x00007fff8b823c09 _CGSSetRegisteredCursor + 190
3 com.apple.CoreGraphics 0x00007fff8b823b2c CGSSetRegisteredCursor + 100
4 com.apple.HIServices 0x00007fff925e3c38 CoreCursorSetAndReturnSeed + 61
5 com.apple.AppKit 0x00007fff929fe9e6 -[NSCursor _reallySet] + 654
6 com.apple.AppKit 0x00007fff929fe6f9 -[NSCursor set] + 223
7 com.apple.AppKit 0x00007fff92b7bcb8 handleCursorRect + 1228
8 com.apple.AppKit 0x00007fff92a2619c -[NSApplication sendEvent:] + 2130
9 com.apple.dt.IDEKit 0x0000000111185c14 -[IDEApplication sendEvent:] + 924
10 com.apple.AppKit 0x00007fff9294fc68 -[NSApplication run] + 711
11 com.apple.AppKit 0x00007fff928cc354 NSApplicationMain + 1832
12 libdyld.dylib 0x00007fff897775c9 start + 1

Add some breakpoints to try.

My app also supports iOS 7 and on my side, my project is also Objective-C based, and ios-charts works fine. So it should be your project issue. Could you try turning off swift optimization and re-compile?

[DarkInsight85]

Hi Xuan,

I have set optimization level to none and re-compile. The code still crash but now at least my Xcode isn't shut down.

The crash happened in ChartUtils line 133, the error in console is "fatal error: value failed to bridge from Swift type to a Objective-C type"

[liuxuan30]

hmm, never see such issue. But I guess stack overflow can provide more help?

At least you should edit your post... delete useless logs.

This is how it bridge on my side:

- (SWIFT_NULLABILITY(nonnull) instancetype)initWithLimit:(double)limit label:(NSString * __nonnull)label OBJC_DESIGNATED_INITIALIZER;

I am wondering, it's a double type, and you are giving 40.6f as float type? Just try 40.6

[DarkInsight85]

Hi I have narrowed down the cause of the crash:

line1.valueFont = [UIFont fontWithName:[NSString stringWithFormat:@"%@-Regular", CLAppFontFamily] size:10.0f];

If I comment out the line above, or replace it with:

line1.valueFont = [UIFont systemFontOfSize:10.0f];

My code would run just fine.

[liuxuan30]

what is CLAppFontFamily... You may need to check if you have the font. I am no expert on this.

[danielgindi]

Your font does not exist, and it returns nil. You cannot pass nil to valueFont as it is defined as non-nullable, and you can see that in your original post.

[DarkInsight85]

Thanks for the help, have resolved this crash.