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by fingerlocks 635 days ago
You should try to implement the iOS photos.app in flutter and see how that goes. This requires scrolling through gigabytes of photos as fast as your finger can swipe without a single hint of slowdown or a loading spinner. And it’s been that fast since.. iOS 7?

Yeah it’s not the language or the SDK that’s slow. Rather it’s inexperienced, lazy, or overworked developers that can’t/won’t write performant software.
3 comments
cageface 635 days ago
I’ve been building iOS apps since before Swift existed. Sure like I said if you code directly to UIKit and take a little care performance is good. It’s also very fast in Flutter with even less care. Rendering images in a grid isn’t hard unless your core abstractions are all wrong.

Now try that in SwiftUI. You’ll be forced back to UICollectionView.

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fingerlocks 635 days ago
That’s cool. I’ve been developing on Mac before Objective-C 2.0 and iOS since the AppStore was released. Millions of downloads, featured in the store, worked on dozens of projects from video games to MFi firmware, and have been invited to Cupertino to meet with teams.

I’m not defending SwiftUI. I mostly use it as a wrapper around NS/UIKit because it’s still buggy and not as flexible.

By the way, SwiftUI is also implemented on top of CALayers just like NS/UIKit. It can be fast in theory, but you have to know exactly where the pain points are and most developers don’t know how to do that.

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vor_ 626 days ago
I'm not sure why you keep bringing up CALayers. That is not where the performance bottleneck lies in SwiftUI.
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kaba0 635 days ago
I don’t think it’s impossible with proper caches to smaller dimension versions (that supposedly Apple already generates/has access to - like they are doing a bunch of processing, like object recognition, etc).
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seec 634 days ago
It's only that fast is the thumbnails are not too slow, the data is all there on device, the phone isn't RAM starved, and you largely have the latest iteration of iPhone for the current software, with the most powerful chip available.

In this way, yeah, it's pretty fast. Any other way it's blank square galore.

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