Best way to observe touchesBegan on an MGLine?-CSDN问答

来自 : CSDN技术社区 发布时间：2021-03-24

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weixin_39641231 2020-12-02 11:46 首页 开源项目 Best way to observe touchesBegan on an MGLine?

Hey there,

Loving MGBox2 so far. I m looking to change the state of a MGLine when the user taps on it, before the finger is released, a lot like the selection highlight on a UITableViewCell.

Any ideas?

Thanks!

该提问来源于开源项目 sobri909/MGBoxKit

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weixin_39892481 3月前

Thank you for MGBox2 ! It s great !

Like jpap, 1 vote for the touch down event handling and highlight and 1 for the issue #42 Publish the development branch :)

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weixin_39564368 3月前

Recently started using MGBox2. Loving it, thank you! :)

1 vote for the touch down event handling and highlight.

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weixin_39944375 3月前

Possibly can get away with a shadow on the scroll view / containing box then.

I m hopefully going to do a chunk of work on MGLine this weekend, as there s a bunch of bugs/limitations that ve popped up since release. It ll most likely involve a BC break, with MGLine becoming a raw base class (ie no underlines), and adding a new MGLineStyled which includes underlines, highlighting, default padding, etc.

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weixin_39641231 3月前

Thanks for your detailed reply. There s not much scrolling or animation in my app, so I ve moved the shadow to the scrollView and it looks lovely.

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weixin_39944375 3月前

Ask Apple :) That limitation drives me crazy.

Options are usually a) put the corner radius on the inner item (ie the row), or b) wrap the whole table section in another view which you use solely for generating the shadow.

You could set the shadow on the scroll view or box that s holding all the table sections, but then you can t [easily] set a shadow path, which will possibly cause scrolling/animation stutters.

I m inclined to think it might be best to put the radius on the top and bottom rows of the section, because that avoids maskToBounds, and avoids nasty shadow hacks. But it means that instead of getting away with just setting a background colour on the row, you d need to do something like add a coloured shape layer with a path that has only two corners rounded.

The code for building and managing such a layer wouldn t be too bad, and probably has less side effects than masking/shadow hacks.

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weixin_39641231 3月前

Aw shucks, you are correct, it did destroy the shadow. Setting the backgroundColor of a MGLine was destroying the cornerRadius... any way to have it both ways?

Edit: obvious option is to create a wrapper view.

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weixin_39944375 3月前

Cool. Looks not too arduous in the end. This is something that should be rolled into MGBox proper, I think, so I ll keep this issue open.

Be wary of the masksToBounds, as it ll probably destroy any shadow you had on the table section.

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weixin_39641231 3月前

Got this working by adding the following to MGLine.m:

 objectivec- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesBegan:touches withEvent:event]; self.backgroundColor [UIColor colorWithRed:0.868 green:0.871 blue:0.880 alpha:1.000];- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesEnded:touches withEvent:event]; self.backgroundColor nil;

And also, for cornerRadius, adding self.layer.masksToBounds YES; to the setup function in MGTableBoxStyled.m

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weixin_39641231 3月前

No go there... but I ll keep trying and will report back when I have something working! Thanks for your help.

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weixin_39944375 3月前

Hm. On the face of it that looks like it should work fine. Maybe you need to call super in your touchesBegan? Not sure. Worth a try.

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weixin_39641231 3月前

Thanks for your help.

I ve done this:

 objectivecMGLine *line [MGLine lineWithLeft: test right:nil size:CGSizeMake(BOX_WIDTH, 42)];SSUITapGestureRecognizer *tapper [[SSUITapGestureRecognizer alloc] initWithTarget:line action:(tapped)];tapper.delegate line;line.tapper tapper;line.onTap ^{ NSLog( you tapped my box! 

With SSUITapGestureRecognizer being a simple:

 objectivec- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event UITouch *firstTouch [[touches allObjects] objectAtIndex:0]; MGLine *line (MGLine *)firstTouch.view; line.backgroundColor [UIColor colorWithRed:0.918 green:0.98 blue:0.969 alpha:1]; line.layer.cornerRadius 4.0;

The background color shows up correctly, but the onTap event is never fired. Any suggestions? If this consumes too much of your time, I m happy to just play around until I get a working solution :)

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weixin_39944375 3月前

Hm. Interesting. I think the way I d go about it is to make a UITapGestureRecognizer subclass and assign it to the line s tapper property (making sure to set the new tapper s delegate to the line). In the subclass I d defined a touchesBegan:withEvent: method, and do the manipulation in there.

That way you can still set an onTap block to do whatever steps you want to happen once the tap is complete.

Although that does feel like a bit of an awkward solution. Perhaps it s something that should be rolled into MGBox proper, in that all tappers/swipers/etc should be custom subclasses that provide easier access to the touchesBegan/etc.

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