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copied!<p>Based on my tests here, properties from categories will show up when using <code>class_copyPropertyList</code>. It looks as though the properties you're seeing on UIView are only <em>described</em> as properties in the public headers, not actually declared as such when building the UIKit itself. Probably they adopted the property syntax to make the creation of the public headers a little quicker.</p> <p>For reference, here's my test project:</p> <pre><code>#import <Foundation/Foundation.h> #import <objc/runtime.h> @interface TestClass : NSObject { NSString * str1; NSString * str2; } @property (nonatomic, copy) NSString * str1; @end @interface TestClass (TestCategory) @property (nonatomic, copy) NSString * str2; @end @implementation TestClass @synthesize str1; @end @implementation TestClass (TestCategory) // have to actually *implement* these functions, can't use @synthesize for category-based properties - (NSString *) str2 { return ( str2 ); } - (void) setStr2: (NSString *) newStr { [str2 release]; str2 = [newStr copy]; } @end int main (int argc, const char * argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; unsigned int outCount, i; objc_property_t *properties = class_copyPropertyList([TestClass class], &outCount); for (i = 0; i < outCount; i++) { objc_property_t property = properties[i]; fprintf(stdout, "%s %s\n", property_getName(property), property_getAttributes(property)); } [pool drain]; return 0; } </code></pre> <p>And here's the output:</p> <pre><code>str2 T@"NSString",C str1 T@"NSString",C,Vstr1 </code></pre>

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