求助：SciChart相关Swift标注代码的Objective-C等效实现

Hey there! I’m glad to help translate your SciChart Swift code to Objective-C and clarify that coordinate mode property. Let’s break this down step by step:

1. Equivalent of customAnnotation.coordinateMode = .relativeY in Objective-C #

In SciChart’s Objective-C API, the SCIAnnotationCoordinateMode enum uses explicit named constants instead of Swift’s concise dot syntax. The exact equivalent line would be:

customAnnotation.coordinateMode = SCIAnnotationCoordinateModeRelativeY;

This achieves the same result as your Swift code, setting the annotation’s coordinate mode to relative Y-axis positioning.

2. Full Objective-C Translation of Your Swift Snippet #

Here’s how to rewrite your annotation setup code in Objective-C, matching the functionality of your Swift snippet:

// Annotation collection property to store all annotations
double totalCapacity = 500.0;
SCIAnnotationCollection *annotationGroup = [[SCIAnnotationCollection alloc] init];

// Assuming 'i' is an integer variable from your loop context
if ((i % 100) == 0) {
    SCICustomAnnotation *customAnnotation = [[SCICustomAnnotation alloc] init];
    UILabel *customAnnotationContentView = [[UILabel alloc] initWithFrame:CGRectMake(/* insert your frame values here */)];
    
    // Add any additional setup for the label or annotation here (example):
    // customAnnotationContentView.text = @"Your Annotation Label";
    // customAnnotation.contentView = customAnnotationContentView;
    // [annotationGroup addAnnotation:customAnnotation];
}

A couple quick reminders:

• Don’t forget to import the necessary SciChart headers (like SciChart.h or specific annotation headers) at the top of your Objective-C file.
• If you had additional logic for styling the annotation or positioning it, you’d extend this code using Objective-C’s property accessors or message syntax, just like you would in Swift.

内容的提问来源于stack exchange，提问作者Val Nenov