Tutorial by Examples

In Objective-C, method swizzling is the process of changing the implementation of an existing selector. This is possible due to the way Selectors are mapped on a dispatch table, or a table of pointers to functions or methods. Pure Swift methods are not dynamically dispatched by the Objective-C run...

Let's swap the implementation of methodOne() and methodTwo() in our TestSwizzling class: class TestSwizzling : NSObject { dynamic func methodOne()->Int{ return 1 } } extension TestSwizzling { //In Objective-C you'd perform the swizzling in load(), //but t...

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], ...