NSObject 理由 NSInvocation 调用方法

NSObject+Extension.h

#import 

@interface NSObject (Extension)
- (id)performSelector:(SEL)selector withObjects:(NSArray *)objects;
@end

NSObject+Extension.m

#import "NSObject+Extension.h"

@implementation NSObject (Extension)

- (id)performSelector:(SEL)selector withObjects:(NSArray *)objects{
    
    // 方法签名(方法的描述)
    NSMethodSignature *signature = [[self class] instanceMethodSignatureForSelector:selector];
    
    if (signature == nil) {
        // @throw [NSException exceptionWithName:@"错误" reason:@"方法找不到" userInfo:nil];
        [NSException raise:@"错误" format:@"%@方法找不到", NSStringFromSelector(selector)];
    }
    
    // NSInvocation : 利用一个NSInvocation对象包装一次方法调用（方法调用者、方法名、方法参数、方法返回值）
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
    invocation.target = self;
    invocation.selector = selector;
    
    // 设置参数
    NSInteger paramsCount = signature.numberOfArguments - 2; // 除self、_cmd以外的参数个数
    paramsCount = MIN(paramsCount, objects.count);
    for (NSInteger i = 0; i < paramsCount; i++) {
        id object = objects[i];
        if ([object isKindOfClass:[NSNull class]]) continue;
        [invocation setArgument:&object atIndex:i + 2];
    }
    
    // 调用方法
    [invocation invoke];
    
    // 获取返回值
    id returnValue = nil;
    if (signature.methodReturnLength) { // 有返回值类型，才去获得返回值
        [invocation getReturnValue:&returnValue];
    }
    
    return returnValue;
}

@end

在AppDelegate.m中可以捕获异常

@implementation AppDelegate

/**
 * 崩溃统计
 * 1.友盟
 * 2.Flurry
 * 3.Crashlytics
 */

/**
 * 拦截异常
 */
void handleException(NSException *exception){
    NSMutableDictionary *info = [NSMutableDictionary dictionary];
    info[@"callStack"] = [exception callStackSymbols]; // 调用栈信息（错误来源于哪个方法）
    info[@"name"] = [exception name]; // 异常名字
    info[@"reason"] = [exception reason]; // 异常描述（报错理由）
    // [info writeToFile:<#(NSString *)#> atomically:<#(BOOL)#>];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    // 将沙盒中的错误信息传递给服务器
    // 设置捕捉异常的回调
    NSSetUncaughtExceptionHandler(handleException);
    
    return YES;
}

@end