- 重载类的“+(void)load”方法，在程序加载到内存时利用Runtime的
method_exchangeImplementations
等接口将方法的实现互相交换。当方法被调用时就会被勾住(Hook)，执行我们的方法。
@interface HookUtility : NSObject
+ (void)swizzlingInClass:(Class)cls originalSelector:(SEL)originalSelector swizzledSelector:(SEL)swizzledSelector;
@end
@implementation HookUtility
+ (void)swizzlingInClass:(Class)cls originalSelector:(SEL)originalSelector swizzledSelector:(SEL)swizzledSelector {
Class class = cls;
Method originalMethod = class_getInstanceMethod(class, originalSelector);
Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
BOOL didAddMethod = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod));
if (didAddMethod) {
class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
} else {
method_exchangeImplementations(originalMethod, swizzledMethod);
}
}
@end
- 页面进入的埋点统计，交换ViewController的DidAppear方法的实现以ViewController的类名为识别符进行埋点统计。
@implementation UIViewController (userStastistics)
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
SEL originalSelector = @selector(viewWillAppear:);
SEL swizzledSelector = @selector(swiz_viewWillAppear:);
[HookUtility swizzlingInClass:[self class] originalSelector:originalSelector swizzledSelector:swizzledSelector];
});
}
- (void)swiz_viewWillAppear:(BOOL)animated {
// 埋点上报
NSString *targetName = NSStringFromClass([self class]);
NSLog(@"上报到数据统计中心的targetName=%@", targetName);
// 执行被交换的实现
[self swiz_viewWillAppear:animated];
}
@end
- 控件交互事件(点击、拖动、双击...)的埋点统计，交换
sendAction:to:forEvent:
方法实现，以按钮的“类名+target名+action名”作为识别符上报数据统计中心
@implementation UIControl (userStastistics)
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
SEL originalSelector = @selector(sendAction:to:forEvent:);
SEL swizzledSelector = @selector(swiz_sendAction:to:forEvent:);
[HookUtility swizzlingInClass:[self class] originalSelector:originalSelector swizzledSelector:swizzledSelector];
});
}
- (void)swiz_sendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event {
//插入埋点代码
[self performUserStastisticsAction:action to:target forEvent:event];
// 执行被交换的实现
[self swiz_sendAction:action to:target forEvent:event];
}
- (void)performUserStastisticsAction:(SEL)action to:(id)target forEvent:(UIEvent *)event; {
NSString *className = NSStringFromClass([self class]);
NSString *targetName = NSStringFromClass([target class]);
NSString *actionString = NSStringFromSelector(action);
NSLog(@"上报到数据统计中心=%@_%@_%@", className, targetName, actionString);
}
@end
- 扩展-页面停留时长统计：可通过以上ViewController的扩展类去扩展属性，在DidAppear方法里给该属性赋值，在DidDisappear方法里计算时间差并且交换方法实现达到页面停留时长埋点需求
- 扩展-批量上报/实时上报：通过本地plist配置文件去自定义一些特殊行为。
