锅炉板规范太多.方法

Question

我有一个简单的UIViewController和9 UIImageViews。当按下每个UIImageView时，调用一个方法(或函数)。这一切都很好，但问题是，我有太多的锅炉板代码现在。

在我的viewDidLoad方法中，当按下我的9个UIImageViews中的任何一个时，我有9个UITapGestureRecognizer要检测。然后，他们调用一个方法来运行。这是我的代码：

UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed1:)];
[picview_1 addGestureRecognizer:tap1];

UITapGestureRecognizer *tap2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed2:)];
[picview_2 addGestureRecognizer:tap2];

UITapGestureRecognizer *tap3 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed3:)];
[picview_3 addGestureRecognizer:tap3];

UITapGestureRecognizer *tap4 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed4:)];
[picview_4 addGestureRecognizer:tap4];

UITapGestureRecognizer *tap5 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed5:)];
[picview_5 addGestureRecognizer:tap5];

UITapGestureRecognizer *tap6 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed6:)];
[picview_6 addGestureRecognizer:tap6];

UITapGestureRecognizer *tap7 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed7:)];
[picview_7 addGestureRecognizer:tap7];

UITapGestureRecognizer *tap8 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed8:)];
[picview_8 addGestureRecognizer:tap8];

UITapGestureRecognizer *tap9 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed9:)];
[picview_9 addGestureRecognizer:tap9];

下面是正在被调用的方法：

-(void)imagepressed1:(UIGestureRecognizer*)sender {
ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
self.seconddata = screen;
seconddata.page_num = page;
screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:screen animated:YES completion:nil];
}

-(void)imagepressed2:(UIGestureRecognizer*)sender {
    ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
    self.seconddata = screen;
    seconddata.page_num = page + 1;
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentViewController:screen animated:YES completion:nil];
}

-(void)imagepressed3:(UIGestureRecognizer*)sender {
    ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
    self.seconddata = screen;
    seconddata.page_num = page + 2;
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentViewController:screen animated:YES completion:nil];
}

-(void)imagepressed4:(UIGestureRecognizer*)sender {
    ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
    self.seconddata = screen;
    seconddata.page_num = page + 3;
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentViewController:screen animated:YES completion:nil];
}

-(void)imagepressed5:(UIGestureRecognizer*)sender {
    ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
    self.seconddata = screen;
    seconddata.page_num = page + 4;
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentViewController:screen animated:YES completion:nil];
}

-(void)imagepressed6:(UIGestureRecognizer*)sender {
    ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
    self.seconddata = screen;
    seconddata.page_num = page + 5;
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentViewController:screen animated:YES completion:nil];
}

-(void)imagepressed7:(UIGestureRecognizer*)sender {
    ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
    self.seconddata = screen;
    seconddata.page_num = page + 6;
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentViewController:screen animated:YES completion:nil];
}

-(void)imagepressed8:(UIGestureRecognizer*)sender {
    ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
    self.seconddata = screen;
    seconddata.page_num = page + 7;
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentViewController:screen animated:YES completion:nil];
}

-(void)imagepressed9:(UIGestureRecognizer*)sender {
    ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
    self.seconddata = screen;
    seconddata.page_num = page + 8;
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentViewController:screen animated:YES completion:nil];
}

正如您所看到的，除了一个小细节之外，我的方法几乎都是相同的，称为"page“的Integer将根据函数的不同而增加一个不同的数字。

有任何方法，我可以实现上述相同的功能，但没有那么多的非专业的副本，我的代码？

谢谢丹。

Answer 1

将picview_N放在数组中，并在循环中向它们添加不同的识别器。为每个picview_N提供一个与您希望添加到page_num中的数字相对应的标记，并使用sender.view.tag在运行时查找该数字：

NSArray *picViews = @[picview_1, picview_2, picview_3, picview_4, picview_5, picview_6, picview_7, picview_8, picview_9];
NSUInteger tag = 1;
for (UIView *picView in picViews) {
    picView.tag = tag++;
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed:)];
    [picView addGestureRecognizer:tap];
}
...
-(void)imagepressed:(UIGestureRecognizer*)sender { // Common for all recognizers
    ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
    self.seconddata = screen;
    seconddata.page_num = page + sender.view.tag;
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentViewController:screen animated:YES completion:nil];
}

Answer 2

你想用的是

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event

此方法返回视图层次结构(包括自身)中包含指定点的接收器的最远的后代。。

因此，假设您在您的UITapGapstureRecogniser对象上设置了一个UIView，并且为每个图像视图设置了标记属性：

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewPressed:)];
[_view_1 addGestureRecognizer:tap];


- (IBAction)viewPressed:(UIGestureRecogniser *)sender{
   CGPoint touchPoint = [sender locationInView:self.view];
   UIView *touchView = [self.view hitTest:touchPoint withEvent:nil];
   if(touhView isKindOfClass:[UIImageView class] && touchView.tag == 1)
   {
     // Do action on touch of imageview 1
   } 
   else if(touhView isKindOfClass:[UIImageView class] && touchView.tag == 2) {
    // Do action on touch of imageview 2
   }
   // similarly for other image views
}

Answer 3

这是一种解决办法，但它仍然不是很好.

picview_1.tag = 0;
picview_2.tag = 1;
picview_3.tag = 2;
picview_4.tag = 3;
picview_5.tag = 4;
picview_6.tag = 5;
picview_7.tag = 6;
picview_8.tag = 7;
picview_9.tag = 8;

UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed:)];
[picview_1 addGestureRecognizer:tap1];

UITapGestureRecognizer *tap2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed:)];
[picview_2 addGestureRecognizer:tap2];

UITapGestureRecognizer *tap3 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed:)];
[picview_3 addGestureRecognizer:tap3];

UITapGestureRecognizer *tap4 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed:)];
[picview_4 addGestureRecognizer:tap4];

UITapGestureRecognizer *tap5 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed:)];
[picview_5 addGestureRecognizer:tap5];

UITapGestureRecognizer *tap6 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed:)];
[picview_6 addGestureRecognizer:tap6];

UITapGestureRecognizer *tap7 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed:)];
[picview_7 addGestureRecognizer:tap7];

UITapGestureRecognizer *tap8 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed:)];
[picview_8 addGestureRecognizer:tap8];

UITapGestureRecognizer *tap9 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imagepressed:)];
[picview_9 addGestureRecognizer:tap9];

至于方法：

-(void)imagepressed:(UIGestureRecognizer*)sender {
ImageViewer *screen = [[ImageViewer alloc] initWithNibName:nil bundle:nil];
self.seconddata = screen;
seconddata.page_num = page + sender.view.tag;
screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:screen animated:YES completion:nil];

}

如果有人知道我如何改进这一点，那将是非常感谢。