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最下方有翻譯總結

1.原文連結：

https://bit.ly/3CKhzuF

2.原文標題：

第三方App動畫在iPhone 13 Pro上最高只能用60Hz更新率

Third-party apps limited to 60Hz animations on iPhone 13 Pro

3.原文來源(媒體/作者)：

9to5mac/Benjamin Mayo

4.原文內容：

Update: Apple has officially responded that some of the behaviours described bel
ow are the result of an OS bug. Full support for 120Hz in third-party apps is co
ming soon. Original story below.

One of the biggest new features exclusive to the iPhone 13 Pro and iPhone 13 Pro
 Max this year is the inclusion of high-refresh rate displays, or what Apple cal
ls “ProMotion.”

That means the iPhone 13 Pro models feature new OLED displays that can refresh t
heir screen content at up to 120 times per second, or 120Hz. However, developers
 receiving their phones today have discovered that, in many circumstances, their
 animations can only run at 60Hz — the same as the cheaper iPhone 13 and iPhone
 13 mini, as well as prior iPhone generations.

As it stands with iOS 15.0, ProMotion takes effect in third-party apps when scro
lling or doing full-screen transitions. That means that you will still get a ver
y fluid and responsive experience when scrolling your Twitter timeline, for inst
ance.

However, almost all other animations are capped at 60Hz in third-party apps. Thi
s includes special effects and animations for custom components. It can be parti
cularly jarring for the same third-party app to feature smooth scrolling but the
n less-smooth interaction experience elsewhere. Developer of the Apollo Reddit c
lient Christian Selig has already reported complaints about this from his custom
ers.

A workaround hidden plist-key has been discovered that lifts the limit for Scene
Kit and SpriteKit based applications, and Dice by PCalc developer James Thomson
is currently seeing if it will pass App Review. However, most animations in iOS
apps are driven by the Core Animation framework and remain limited to 60Hz, even
 in the presence of this special undocumented plist entry.

Interestingly, these limits do not apply to third-party apps running on the iPad
 Pro, which has featured a 120Hz display since 2017.

Apple appears to have specially carved out these restrictions for the new iPhone
 models. One source suggested that this had been implemented for battery life re
asons. However, we don’t know for sure if that is the case.

Perhaps more conspiratorially, examination of iOS 15 code indicates that only th
ird-party apps are being constrained. Code in the OS exempts first-party Apple a
pps and allows them to run at full 120Hz animation speed all the time.

Apple touts ProMotion on the iPhone as an adaptive system that ramps up and ramp
s down depending on what the user is doing. For instance, if the screen is dorma
nt, the phone can lower itself to a 10Hz refresh rate to save power. However, cu
stomers and developers reasonably expected that app animations would be able to
take advantage of the 120Hz hardware for super fluid animations, just like they
can get with scrolling. Apple’s apps certainly seem allowed to do just that, as
 all apps can on the iPad Pro, but not third-party apps on the iPhone 13.

It’s still possible this is all just a bug in the 15.0 implementation, but it s
adly seems unlikely in the presence of the code evidence. We’ve contacted Apple
 about this situation for clarification and will update if we hear back.


5.心得/評論：

簡短翻譯如下

部份App開發人員發現第三方軟體上的特效與動畫只能上到60Hz，而非120Hz，這種情況可能
令人覺得打開App會有卡頓感。與此同時，iPad Pro上卻沒有此限制



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