Open Source Tool For Automatically Graphing Objective-C Class/Instance Details

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Just over a year ago I mentioned an open source tool that allows you to create class dependency graphs from your Objective-C code viewable in GraphViz.

Here’s another Objective-C graphing tool called ObjcViz originally created by Oliver Gutknecht and updated by Graham Lee to run with the new Obj-C runtime.

This tool allows you to gather detailed information about the classes and instances running in a program and creates code that you can load into GraphViz.

Here’s an example from the home page – you can take code like this:

@interface Bu : NSObject
{
NSString* superclassIvar;
}
@end

@interface Meu : NSObject
{
id obj;
}
@end

@implementation Meu

–(id)init
{
[super init];
obj = @"hello";
return self;
}

@end

@interface Zo : Bu
{
NSString* d;
id e;
}
@end

@implementation Zo

–(id)init
{
[super init];
e = [NSScanner
scannerWithString:@"scannedString"]
[e retain];
return self;
}

@end

@interface Ga : NSObject
{
NSString* strIvar;
NSMutableArray* arrayIvar;
NSMutableDictionary* dictIvar;
Zo* boIvar;
}
@end

@implementation Ga

–(id)init
{
[super init];
strIvar = @"aString";
boIvar = [[Zo alloc] init];
arrayIvar = [[NSArray alloc]
initWithObjects:@"aStringInArray",
[NSDate date], nil];
dictIvar = [[NSMutableDictionary alloc]
initWithObjectsAndKeys:boIvar,@"Key1",@"Obj2",@"Key2",nil];
return self;
}