指定 Unity 尝试渲染游戏的目标帧率。
一个大于 0 的整数，或特殊值 -1（默认值）。
桌面和网页：如果 QualitySettings.vSyncCount 设置为 0，则 Application.targetFrameRate 会为游戏选择目标帧率。如果 vSyncCount != 0，则忽略 targetFrameRate。
Android 和 iOS：移动平台始终忽略 QualitySettings.vSyncCount，而是使用 Application.targetFrameRate 为游戏选择目标帧率。使用 targetFrameRate 控制游戏的帧率。这对于限制游戏的帧率很有用，可以确保游戏在繁重的渲染工作负载下流畅且稳定地显示。您还可以降低游戏的帧率以节省电池电量并在移动设备上避免过热。
当 QualitySettings.vSyncCount = 0 且 Application.targetFrameRate = -1 时
- 桌面：内容以尽可能快的速度异步渲染。
- 网页：内容以原生显示器刷新率渲染。
- Android 和 iOS：内容以固定 30 fps 渲染以节省电量，与显示器的原生刷新率无关。
桌面和网页：建议使用 QualitySettings.vSyncCount 而不是 Application.targetFrameRate，因为 vSyncCount 实现了一种基于硬件的同步机制，而 targetFrameRate 是一种基于软件的定时方法，容易出现微卡顿。换句话说，在桌面和网页平台上，设置 vSyncCount = 0 并使用 targetFrameRate 不会产生完全无卡顿的输出。当需要平滑的帧速率时，始终使用 vSyncCount > 0。
网页、Android 和 iOS：渲染始终受显示器最大刷新率的限制。将 vSyncCount 设置为 0 并将 targetFrameRate 设置为任意高值都不会超过显示器的原生刷新率，即使渲染工作负载足够低。
Android 和 iOS：要在显示器的原生刷新率下渲染，请将 Application.targetFrameRate 设置为 Resolution.refreshRateRatio 字段（位于 Screen.currentResolution 属性中）的值。
iOS：显示器的原生刷新率由 Apple 的ProMotion功能控制。当项目中禁用 ProMotion（新项目的默认设置）时，原生刷新率为 60 Hz。启用 ProMotion 时，支持 ProMotion 的 iOS 显示器的原生刷新率为 120 Hz，否则为 60 Hz。
Android 和 iOS：如果指定的速率不能均匀地划分显示器的当前刷新率，则 Application.targetFrameRate 的值将向下舍入到最接近的可以均匀划分的数字。例如，在 60Hz 的 Android 显示器上运行时，如果 Application.targetFrameRate = 25，则内容实际上以 20fps 渲染，因为 20 是低于 25 且可以均匀划分 60 的最大数字。
VR 平台
VR 平台会忽略 QualitySettings.vSyncCount 和 Application.targetFrameRate，而是由 VR SDK 控制帧率。
Unity 编辑器
在编辑器中，Application.targetFrameRate 仅影响游戏视图。它对其他编辑器窗口没有影响。
其他资源：QualitySettings.vSyncCount、Screen.currentResolution。
using UnityEngine;
public class Example { void Start() { // Limit framerate to cinematic 24fps. QualitySettings.vSyncCount = 0; // Set vSyncCount to 0 so that using .targetFrameRate is enabled. Application.targetFrameRate = 24; } }
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