MXErrorDomain
TypeScriptconst MXErrorDomain: stringlet MXErrorDomain: StringSystem · IOS API REFERENCE
MetricKit
Measure your app’s performance using daily metric and diagnostic reports from real users.
120 types
427 callable entries
7 skipped
98% entry coverage
Generated from iOS SDK 27.1. Availability is shown on each declaration; permissions and entitlements still apply.
Types
AppLaunchDiagnostic
struct · iOS 27.0+
ApplicationResumeTimeMetric
struct · iOS 27.0+
AveragePixelLuminance
class · iOS 27.0+
AverageStatistics
struct · iOS 27.0+
BackgroundTerminationMetric
struct · iOS 27.0+
CallStackFrame
struct · iOS 27.0+
CallStackThread
struct · iOS 27.0+
CallStackTree
struct · iOS 27.0+
CallStackTree.BinaryInfo
struct · iOS 27.0+
CellularConditionTimeMetric
struct · iOS 27.0+
CPUExceptionDiagnostic
struct · iOS 27.0+
CPUInstructionsCountMetric
struct · iOS 27.0+
CPUTimeMetric
struct · iOS 27.0+
CrashDiagnostic
struct · iOS 27.0+
CrashDiagnostic.ObjectiveCExceptionReason
struct · iOS 27.0+
CrashDiagnostic.TerminationCategory
struct · iOS 27.0+
CrashDiagnostic.TerminationCategory.RawValue
typealias · iOS 27.0+
CrashDiagnostic.TerminationReason
struct · iOS 27.0+
CrashDiagnostic.TerminationReason.RawValue
typealias · iOS 27.0+
DiagnosticReport
struct · iOS 27.0+
DiagnosticReport.Environment
struct · iOS 27.0+
DiagnosticResult
enum · iOS 27.0+
DiskWriteExceptionDiagnostic
struct · iOS 27.0+
ExtendedLaunchMetric
struct · iOS 27.0+
ForegroundTerminationMetric
struct · iOS 27.0+
GPUTimeMetric
struct · iOS 27.0+
HangDiagnostic
struct · iOS 27.0+
HangTimeMetric
struct · iOS 27.0+
Histogram
struct · iOS 27.0+
Histogram.Bucket
struct · iOS 27.0+
HitchTimeMetric
struct · iOS 27.0+
HitchTimeRatio
class · iOS 27.0+
LaunchTaskID
struct · iOS 27.0+
LaunchTaskID.ExtendedGraphemeClusterLiteralType
typealias · iOS 27.0+
LaunchTaskID.RawValue
typealias · iOS 27.0+
LaunchTaskID.StringLiteralType
typealias · iOS 27.0+
LaunchTaskID.UnicodeScalarLiteralType
typealias · iOS 27.0+
LocationActivityTimeMetric
struct · iOS 27.0+
LogicalDiskWritesMetric
struct · iOS 27.0+
MemoryExceptionDiagnostic
struct · iOS 27.0+
MetalFrameRateMetric
struct · iOS 27.0+
MetricGroup
struct · iOS 27.0+
MetricGroup.RawValue
typealias · iOS 27.0+
MetricManager
class · iOS 27.0+
MetricManager.LaunchTaskError
struct · iOS 27.0+
MetricManager.LaunchTaskError.Reason
enum · iOS 27.0+
MetricManager.LaunchTaskError.Reason.RawValue
typealias · iOS 27.0+
MetricManager.ReportedState
struct · iOS 27.0+
MetricReport
struct · iOS 27.0+
MetricReport.EncodingFormat
enum · iOS 27.0+
MetricReport.Environment
struct · iOS 27.0+
MetricReport.IntervalEntry
struct · iOS 27.0+
MetricReport.StateEntry
struct · iOS 27.0+
MetricResult
enum · iOS 27.0+
MXAnimationMetric
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXAppExitMetric
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXAppLaunchDiagnostic
class · iOS 16.0+ · Deprecated in iOS 100000.0
MXAppLaunchMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXAppResponsivenessMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXAppRunTimeMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXAverage
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXBackgroundExitData
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXCallStackTree
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXCellularConditionMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXCPUExceptionDiagnostic
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXCPUMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXCrashDiagnostic
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXCrashDiagnosticObjectiveCExceptionReason
class · iOS 17.0+ · Deprecated in iOS 100000.0
MXDiagnostic
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXDiagnosticPayload
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXDiskIOMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXDiskSpaceUsageMetric
class · iOS 26.0+ · Deprecated in iOS 100000.0
MXDiskWriteExceptionDiagnostic
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXDisplayMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXError
struct · iOS 16.0+ · Deprecated in iOS 100000.0
MXError.Code
enum · iOS 16.0+ · Deprecated in iOS 100000.0
MXForegroundExitData
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXGPUMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXHangDiagnostic
class · iOS 14.0+ · Deprecated in iOS 100000.0
MXHistogram
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXHistogramBucket
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXLaunchTaskID
struct · iOS 16.0+ · Deprecated in iOS 100000.0
MXLocationActivityMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXMemoryMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXMetaData
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXMetricManager
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXMetricManagerSubscriber
protocol · iOS 13.0+ · Deprecated in iOS 100000.0
MXMetricPayload
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXNetworkTransferMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXSignpostIntervalData
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXSignpostMetric
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXSignpostRecord
class · iOS 17.0+ · Deprecated in iOS 100000.0
MXUnitAveragePixelLuminance
class · iOS 13.0+ · Deprecated in iOS 100000.0
MXUnitSignalBars
class · iOS 13.0+ · Deprecated in iOS 100000.0
OptimizedTimeToFirstDrawMetric
struct · iOS 27.0+
OSVersion
struct · iOS 27.0+
PeakMemoryMetric
struct · iOS 27.0+
PixelLuminanceMetric
struct · iOS 27.0+
SignalBars
class · iOS 27.0+
SignpostIntervalMetric
struct · iOS 27.0+
SignpostRecord
struct · iOS 27.0+
StateReportingDomain
struct · iOS 27.0+
StateReportingDomain.ExtendedGraphemeClusterLiteralType
typealias · iOS 27.0+
StateReportingDomain.RawValue
typealias · iOS 27.0+
StateReportingDomain.StringLiteralType
typealias · iOS 27.0+
StateReportingDomain.UnicodeScalarLiteralType
typealias · iOS 27.0+
SuspendedMemoryMetric
struct · iOS 27.0+
TimeToFirstDrawMetric
struct · iOS 27.0+
TotalBackgroundAudioTimeMetric
struct · iOS 27.0+
TotalBackgroundLocationTimeMetric
struct · iOS 27.0+
TotalBackgroundTimeMetric
struct · iOS 27.0+
TotalCellularDownloadMetric
struct · iOS 27.0+
TotalCellularUploadMetric
struct · iOS 27.0+
TotalDiskSpaceCapacityMetric
struct · iOS 27.0+
TotalFileCountMetric
struct · iOS 27.0+
TotalFileSizeMetric
struct · iOS 27.0+
TotalForegroundTimeMetric
struct · iOS 27.0+
TotalWiFiDownloadMetric
struct · iOS 27.0+
TotalWiFiUploadMetric
struct · iOS 27.0+
Functions and constants
init
TypeScriptstatic init(): MXAverage<_Foundation_Unit>init()averageMeasurement
TypeScriptget averageMeasurement(): _Foundation_Measurement<_Foundation_Unit>var averageMeasurement: Measurement<UnitType> { get }sampleCount
TypeScriptget sampleCount(): numbervar sampleCount: Int { get }standardDeviation
TypeScriptget standardDeviation(): numbervar standardDeviation: Double { get }init
TypeScriptstatic init(): MXHistogram<_Foundation_Unit>init()bucketEnumerator
TypeScriptget bucketEnumerator(): _Foundation_NSEnumeratorvar bucketEnumerator: NSEnumerator { get }totalBucketCount
TypeScriptget totalBucketCount(): numbervar totalBucketCount: Int { get }init
TypeScriptstatic init(): MXHistogramBucket<_Foundation_Unit>init()bucketCount
TypeScriptget bucketCount(): numbervar bucketCount: Int { get }bucketEnd
TypeScriptget bucketEnd(): _Foundation_Measurement<_Foundation_Unit>var bucketEnd: Measurement<UnitType> { get }bucketStart
TypeScriptget bucketStart(): _Foundation_Measurement<_Foundation_Unit>var bucketStart: Measurement<UnitType> { get }mxSignpost
TypeScriptmxSignpost(type: SDKHandle, log: SDKHandle, name: SDKHandle, signpostID?: SDKHandle, format?: SDKHandle, arguments_?: Array<SDKHandle>): voidfunc mxSignpost(_ type: OSSignpostType, dso: UnsafeRawPointer = #dsohandle, log: OSLog, name: StaticString, signpostID: OSSignpostID = .exclusive, _ format: StaticString = "%{public}s", _ arguments: [any CVarArg] = ["NO_METRICS"])standardDeviation
TypeScriptget standardDeviation(): (number) | nulllet standardDeviation: Double?The standard deviation of the distribution of values used to calculate the average. This value is `nil` when the standard deviation is not available.
count
TypeScriptget count(): numberlet count: IntThe number of samples used to calculate the average.
average
TypeScriptget average(): _Foundation_Measurement<_Foundation_Dimension>let average: Measurement<DimensionType>The average measurement value.
mxSignpostAnimationIntervalBegin
TypeScriptmxSignpostAnimationIntervalBegin(log: SDKHandle, name: SDKHandle, signpostID?: SDKHandle, format?: SDKHandle, arguments_?: Array<SDKHandle>): voidfunc mxSignpostAnimationIntervalBegin(dso: UnsafeRawPointer = #dsohandle, log: OSLog, name: StaticString, signpostID: OSSignpostID = .exclusive, _ format: StaticString = "%{public}s", _ arguments: [any CVarArg] = ["NO_METRICS"])lowerBound
TypeScriptget lowerBound(): _Foundation_Measurement<_Foundation_Dimension>let lowerBound: Measurement<DimensionType>upperBound
TypeScriptget upperBound(): _Foundation_Measurement<_Foundation_Dimension>let upperBound: Measurement<DimensionType>count
TypeScriptget count(): numberlet count: Intbuckets
TypeScriptget buckets(): Array<Histogram_Bucket<_Foundation_Dimension>>let buckets: [Histogram<DimensionType>.Bucket]Skipped declarations
7 declarations were excluded from these bindings. Each reason comes from the generator or the iOS SDK compiler.
Array.byStateReportingDomain
The containing type is outside the generated SDK type index.
Array.fullDayEntry
The containing type is outside the generated SDK type index.
Array.byStateReportingDomain
The containing type is outside the generated SDK type index.
MetricManager.trackLaunchTask(id:onTrackingError:_:)
synchronous callback requires a nonescaping JS-thread call
StateReportingDomain.init(codingKey:)
This declaration needs Swift generic type arguments. (no canonical witness for T)
MXUnitAveragePixelLuminance.init()
inherited init: clang: 'init' is unavailable
MXUnitSignalBars.init()
inherited init: clang: 'init' is unavailable