从void调用IBAction

Question

这是我的代码。我想该按钮时，计时器达到0变化，但它不工作：

-(void) SwitchView{ 

    [switchingTimer invalidate]; 
    self.SwitchingTimer = nil; 
    [self bomb:nil]; 
} 

-(IBAction)bomb:(UIButton *)sender { 
    UIButton *button = (UIButton *)sender; 
    [button setImage:[UIImage imageNamed:@"black_bomb.png"] forState:UIControlStateNormal]; 
    int xmin = ([button frame].size.width)/2; 
    int ymin = ([button frame].size.height)/2; 

    int x = xmin + arc4random_uniform(self.view.frame.size.width - button.frame.size.width); 
    int y = ymin + arc4random_uniform(self.view.frame.size.height - button.frame.size.height); 
    [button setCenter:CGPointMake(x, y)]; 


    [self flower:sender]; 
} 

-(IBAction)flower:(UIButton *)sender{ 

    UIButton *button2 = (UIButton *)sender; 
    [button2 setImage:[UIImage imageNamed:@"red_rose_flower_6.png"] forState:UIControlStateNormal]; 
    int xmin = ([button2 frame].size.width)/2; 
    int ymin = ([button2 frame].size.height)/2; 
    int x = xmin + arc4random_uniform(self.view.frame.size.width - button2.frame.size.width); 
    int y = ymin + arc4random_uniform(self.view.frame.size.height - button2.frame.size.height); 
    [button2 setCenter:CGPointMake(x, y)]; 
if (self.switchingTimer == nil) { 
    self.switchingTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(SwitchView) userInfo:nil repeats:YES]; 
} 

Answer 1

要调用
[self bomb:nil];
与nil发件人。

但bomb方法使用发送方：

-(IBAction)bomb:(UIButton *)sender { 
    UIButton *button = (UIButton *)sender; 

但呼叫发送nil为sender。

要么提供的bomb呼叫
的UIButton指针或不使用sender但UIButton指针。

UIButton指针可以来自IBOutlet。