Swift Language Method Swizzling Basics of Swizzling - Objective-C
Example
Objective-C example of swizzling UIView's initWithFrame: method
static IMP original_initWithFrame;
+ (void)swizzleMethods {
static BOOL swizzled = NO;
if (!swizzled) {
swizzled = YES;
Method initWithFrameMethod =
class_getInstanceMethod([UIView class], @selector(initWithFrame:));
original_initWithFrame = method_setImplementation(
initWithFrameMethod, (IMP)replacement_initWithFrame);
}
}
static id replacement_initWithFrame(id self, SEL _cmd, CGRect rect) {
// This will be called instead of the original initWithFrame method on UIView
// Do here whatever you need...
// Bonus: This is how you would call the original initWithFrame method
UIView *view =
((id (*)(id, SEL, CGRect))original_initWithFrame)(self, _cmd, rect);
return view;
}
