NSSelectorFromString 的使用，根据字符串来调用相应名字的方法

看代码

[self doAction:@"testA" andArgObject:nil];[self doAction:@"testB:" andArgObject:@"xixi"];-(void) doAction:(NSString *)methodsName andArgObject:(id)objectArg{    SEL selector = NSSelectorFromString(methodsName);    if (self)    {        if ([self respondsToSelector:selector])        {            [self performSelectorOnMainThread:selector withObject:objectArg waitUntilDone:NO];        }    }}-(void) testA{    NSLog(@"do testA");}-(void) testB:(NSString *) str{    NSLog(@"do testB :%@",str);}

结果 log

2016-08-10 12:18:04.823 [94548:2783958] do testA
2016-08-10 12:18:05.602 [94548:2783958] do testB :xixi