这个库功能跟aspects基本一样，只有api上有细微差点……建议写相关功能先调研一下相关的库，避免重复造轮子 about sdmagichook HOT 1 CLOSED

Test *testObj = [Test new];
[testObj aspect_hookSelector:@selector(sumWithA:b:c:d:) withOptions:AspectPositionBefore usingBlock:^(id<AspectInfo> info, int a, int b, int c, int d) {
    int aa = a * a;
    int bb = b * b;
    int cc = c * c;
    int dd = d * d;
    [info.originalInvocation setArgument:&aa atIndex:2];
    [info.originalInvocation setArgument:&bb atIndex:3];
    [info.originalInvocation setArgument:&cc atIndex:4];
    [info.originalInvocation setArgument:&dd atIndex:5];
} error:NULL];

int sum = [testObj sumWithA:1 b:2 c:3 d:4];
NSLog(@">>>> %d", sum); // >>>> 30

Test *testObj = [Test new];
[testObj hookMethod:@selector(sumWithA:b:c:d:) impBlock:^(typeof(testObj) this, int a, int b, int c, int d) {
    __block int res;
    [this callOriginalMethodInBlock:^{
        res = [this sumWithA:a * a b:b * b c:c * c d:d * d];
    }];
    return res;
}];

int sum = [testObj sumWithA:1 b:2 c:3 d:4];
NSLog(@">>>> %d", sum); // >>>> 30