swizzlingMethod方法混写示例

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记得头文件里面#import <objc/runtime.h>

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+ (void)load {
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
		[self swizzlingMethod:@selector(executeQuery:) with:@selector(swizzling_executeQuery:)];
	});
}

+ (void)swizzlingMethod:(SEL)selector1 with:(SEL)selector2 {
	Method originalMethod = class_getInstanceMethod([self class], selector1);
	Method swizzlingMethod = class_getInstanceMethod([self class], selector2);
	method_exchangeImplementations(originalMethod, swizzlingMethod);
}