Aspects is a delightful, simple library for aspect oriented programming.

YLHook enables Aspects to support functional programming.

Why to use YLHook

We often write a lot of code to print logs or carry out statistical information everywhere. AOP provides a concise way to solve those Cross-cutting Concerns.

Aspects Demo:

[UIViewController aspect_hookSelector:@selector(viewWillAppear:) withOptions:AspectPositionBefore usingBlock:^(id<AspectInfo> aspectInfo, BOOL animated) {
    NSLog(@"[%@]before viewWillAppear",[[aspectInfo instance] class]);
} error:NULL];

It's really very simple. But it's not clean when we need hook a lot of methods at one class.

It will be like this:

[UIViewController aspect_hookSelector:@selector(viewWillAppear:) withOptions:AspectPositionAfter usingBlock:^(id<AspectInfo> aspectInfo, BOOL animated) {
    NSLog(@"[%@]after viewWillAppear",[[aspectInfo instance] class]);
} error:NULL];

[UIViewController aspect_hookSelector:@selector(viewDidLoad:) withOptions:AspectPositionBefore usingBlock:^(id<AspectInfo> aspectInfo, BOOL animated) {
    NSLog(@"[%@]before viewDidLoad",[[aspectInfo instance] class]);
} error:NULL];

[UIViewController aspect_hookSelector:@selector(viewDidAppear:) withOptions:AspectPositionBefore usingBlock:^(id<AspectInfo> aspectInfo, BOOL animated) {
    NSLog(@"[%@]before viewDidAppear",[[aspectInfo instance] class]);
} error:NULL];

Now, you can hook methods by this way:

[UIViewController yl_makeEvents:^(YLHookEventMaker *make) {
        make.after.sel(viewDidLoad).block(^(id<AspectInfo> aspectInfo){
            NSLog(@"[%@]after viewDidLoad",[[aspectInfo instance] class]);
        });
        make.before.sel(viewWillAppear:).block(^(id<AspectInfo> aspectInfo){
            NSLog(@"[%@]before viewWillAppear",[[aspectInfo instance] class]);
        });
        make.before.sel(viewDidAppear:).block(^(id<AspectInfo> aspectInfo){
            NSLog(@"[%@]before viewDidAppear",[[aspectInfo instance] class]);
        });
  }];

This style is like Masonry. In fact, I did refer to Masonry's realization.

Usage

You can easy to get an instance of YLHook by static method below:

+ (YLHook *)hookClass:(Class)cls;
+ (YLHook *)hookClassByName:(NSString *)name;
+ (YLHook *)hookInstance:(id)instance;

[[YLHook hookClassByName:@"UIViewController"] makeEvents:^(YLHookEventMaker *make) {
    make.before.sel(viewDidAppear:).block(^(id<AspectInfo> aspectInfo){
        NSLog(@"[%@]before viewDidAppear",[[aspectInfo instance] class]);
    });
}];

\\ or

[UIViewController yl_makeEvents:^(YLHookEventMaker *make) {
    make.before.sel(viewDidAppear:).block(^(id<AspectInfo> aspectInfo){
        NSLog(@"[%@]before viewDidAppear",[[aspectInfo instance] class]);
    });
}];

The excute of YLHookEvent is an optional semantic filler just like with in Masonry.

Installation

If you use Cocoapods, add pod 'YLHook', '~> 1.0.2' to your Podfile.

If not, drag the two files YLHook.h/m into your project. This library relies on Aspects. And you also need drag Aspects.h/m into your project.

中文介绍

链接

License

YLHook is released under the MIT license. See LICENSE for details.

Release Notes

Version 1.0.2

• fix bug of catch

Version 1.0.1

• Use sel instead of selector. And don't need to wirte @"" any more.

Version 1.0.0

• init