Log any method call of object in Objective-C
打印 Objective-C 对象中的任何方法
+ (void)logMethodWithClass:(Class)aClass
condition:(BOOL(^)(SEL sel)) condition
before:(void(^)(id target, SEL sel, NSArray *args, int deep)) before
after:(void(^)(id target, SEL sel, NSArray *args, NSTimeInterval interval, int deep, id retValue)) after;
aClass:要打印的类
condition:根据此 block 来决定是否追踪方法(sel 是方法名)
before:方法调用前会调用该 block(target 是检测的对象,sel 是方法名,args 是参数列表,deep 是调用层级)
after:方法调用后会调用该 block(interval 是执行方法的耗时,retValue 是返回值)
1.打印一个类定义的所有方法,包括公开方法和私有方法:
[ANYMethodLog logMethodWithClass:[UIViewController class] condition:^BOOL(SEL sel) {
NSLog(@"method:%@", NSStringFromSelector(sel));
return NO;
} before:nil after:nil];
2.打印在运行过程中调用了哪些方法:
[ANYMethodLog logMethodWithClass:[UIViewController class] condition:^BOOL(SEL sel) {
return YES;
} before:^(id target, SEL sel, NSArray *args, int deep) {
NSLog(@"target:%@ sel:%@", target, NSStringFromSelector(sel));
} after:nil];
3.打印特定几个方法的调用顺序:
[ANYMethodLog logMethodWithClass:[UIViewController class] condition:^BOOL(SEL sel) {
NSArray *whiteList = @[@"loadView", @"viewWillAppear:", @"viewDidAppear:", @"viewWillDisappear:", @"viewDidDisappear:", @"viewWillLayoutSubviews", @"viewDidLayoutSubviews"];
return [whiteList containsObject:NSStringFromSelector(sel)];
} before:^(id target, SEL sel, NSArray *args, int deep) {
NSLog(@"target:%@ sel:%@", target, NSStringFromSelector(sel));
} after:nil];
4.打印调用方法时的参数值:
[ANYMethodLog logMethodWithClass:NSClassFromString(@"UIViewController") condition:^BOOL(SEL sel) {
return [NSStringFromSelector(sel) isEqualToString:@"viewWillAppear:"];
} before:^(id target, SEL sel, NSArray *args, int deep) {
NSLog(@"before target:%@ sel:%@ args:%@", target, NSStringFromSelector(sel), args);
} after:nil];
5.打印某个方法调用前后的变化:
[ANYMethodLog logMethodWithClass:NSClassFromString(@"ListController") condition:^BOOL(SEL sel) {
return [NSStringFromSelector(sel) isEqualToString:@"changeBackground"];
} before:^(id target, SEL sel, NSArray *args, int deep) {
NSLog(@"before background color:%@", [(ListController *)target view].backgroundColor);
} after:^(id target, SEL sel, NSArray *args, NSTimeInterval interval, int deep, id retValue) {
NSLog(@"after background color:%@", [(ListController *)target view].backgroundColor);
}];
6.打印某个方法调用的耗时:
[ANYMethodLog logMethodWithClass:NSClassFromString(@"ListController") condition:^BOOL(SEL sel) {
return [NSStringFromSelector(sel) isEqualToString:@"changeBackground"];
} before:^(id target, SEL sel, NSArray *args, int deep) {
} after:^(id target, SEL sel, NSArray *args, NSTimeInterval interval, int deep, id retValue) {
NSLog(@"interval::%@", [@(interval) stringValue]);
}];
7.追踪方法调用顺序:
[ANYMethodLog logMethodWithClass:NSClassFromString(@"ListController") condition:^BOOL(SEL sel) {
return YES;
} before:^(id target, SEL sel, NSArray *args, int deep) {
NSString *selector = NSStringFromSelector(sel);
NSArray *selectorArrary = [selector componentsSeparatedByString:@":"];
selectorArrary = [selectorArrary filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"length > 0"]];
NSMutableString *selectorString = [NSMutableString new];
for (int i = 0; i < selectorArrary.count; i++) {
[selectorString appendFormat:@"%@:%@ ", selectorArrary[i], args[i]];
}
NSMutableString *deepString = [NSMutableString new];
for (int i = 0; i < deep; i++) {
[deepString appendString:@"-"];
}
NSLog(@"%@[%@ %@]", deepString , target, selectorString);
} after:^(id target, SEL sel, NSArray *args, NSTimeInterval interval, int deep, id retValue) {
NSMutableString *deepString = [NSMutableString new];
for (int i = 0; i < deep; i++) {
[deepString appendString:@"-"];
}
NSLog(@"%@ret:%@", deepString, retValue);
}];
利用runtime交换方法的实现。动态创建新方法,在新方法里再调用原来的方法。现阶段还不是很完美地调用原来方法,在需要传参的方法会出现传参失败,在真机问题较多,在模拟器问题较少,在用的时候可以过滤掉需要传参的方法。
1.把原方法的 IMP
换成 _objc_msgForward
,使之触发 forwardInvocation
方法;
2.把方法 forwardInvocation
的 IMP
换成 qhd_forwardInvocation
;
3.创建一个新方法,IMP
就是原方法的原来的 IMP
,那么只要在 qhd_forwardInvocation
调用新方法即可。那么就可以在 qhd_forwardInvocation
插入 log 。
欢迎提 Issues 和 Pull requests