stf的苹果手机设备分辨率低解决

static NSUInteger FBMjpegServerScreenshotQuality = 25;
static NSUInteger FBMjpegServerFramerate = 10;
static NSUInteger FBScreenshotQuality = 1;
static NSUInteger FBMjpegScalingFactor = 100;

帧率我们可以直接设置到最大 60，记住千万别修改 FBMjpegScalingFactor 的值，一旦在 WDA 做了缩放，帧率就会下降到 5 帧左右，甚至更低。至于压缩质量 FBMjpegServerScreenshotQuality ，太低了延时会比较大，太高了帧率会降低，建议设置 40-60 之间。

实际设置为：

FBConfiguration.m

static NSString *FBElementResponseAttributes = @"type,label";
static NSUInteger FBMaxTypingFrequency = 60;
static NSUInteger FBMjpegServerScreenshotQuality = 60;
static NSUInteger FBMjpegServerFramerate = 60;
static NSUInteger FBScreenshotQuality = 1;
static NSUInteger FBMjpegScalingFactor = 100;
static NSTimeInterval FBSnapshotTimeout = 65.;