let alert = UIAlertController(title: "", message: "提交成功！感谢您的反馈，我们将持续为您改进。", preferredStyle: .alert)
let sureAction = UIAlertAction(title: "确定", style: .default) { [weak self] _ in
self?.navigationController?.popViewController(animated: true)
        }
let originStr = "提交成功！感谢您的反馈，我们将持续为您改进。"
let attrStr = NSMutableAttributedString(string: originStr)
let style = NSMutableParagraphStyle()
style.alignment = .left
attrStr.addAttributes([NSAttributedString.Key.paragraphStyle: style], range: NSMakeRange(0, originStr.count))
attrStr.addAttributes([NSAttributedStringKey.font: UIFont(name: "PingFangSC-Regular", size: 15) ?? UIFont.systemFont(ofSize: 15)], range: NSMakeRange(0, originStr.count))
alert.setValue(attrStr, forKey: "attributedMessage")

alert.addAction(sureAction)
present(alert, animated: true, completion: nil)

附上UIAlertController的IvarList和PropertyList,其他自定义需求可自行key Value

********** UIAlertController  IvarList ****************

_message ----- @"NSString" 

_attributedTitle ----- @"NSAttributedString" 

_attributedMessage ----- @"NSAttributedString" 

_attributedDetailMessage ----- @"NSAttributedString" 

_linkedAlertControllers ----- @"NSSet" 

_cancelAction ----- @"UIAlertAction" 

_actionToKeyCommandsDictionary ----- @"NSMutableDictionary" 

_keyCommandToActionMapTable ----- @"NSMapTable" 

_resolvedStyle ----- q 

_preferredStyle ----- q 

_contentViewController ----- @"UIViewController" 

_textFieldViewController ----- @"_UIAlertControllerTextFieldViewController" 

_backButtonDismissGestureRecognizer ----- @"UITapGestureRecognizer" 

_ownedTransitioningDelegate ----- @ 

_addContentViewControllerToViewHierarchyNeeded ----- B 

_isInSupportedInterfaceOrientations ----- B 

_batchActionChangesInProgressCount ----- q 

_presenter ----- @"_UIAlertControllerShimPresenter" 

_actionsWithInvokedHandlers ----- @"NSPointerArray" 

_hidden ----- B 

_springLoaded ----- B 

__shouldFlipFrameForShimDismissal ----- B 

__shouldAllowNilParameters ----- B 

_hasPreservedInputViews ----- B 

_actions ----- @"NSMutableArray" 

_headerContentViewController ----- @"UIViewController" 

_styleProvider ----- @"NSObject<UIAlertControllerVisualStyleProviding>" 

_preferredAction ----- @"UIAlertAction" 

_temporaryAnimationCoordinator ----- @"_UIAnimationCoordinator" 

_previewInteractionController ----- @"UIPreviewInteractionController" 

__visualStyle ----- @"UIAlertControllerVisualStyle" 

_accessibilityViewControllerForSizing ----- @"UIViewController" 

_indexesOfActionSectionSeparators ----- @"NSIndexSet" 

__actionDelimiterIndices ----- @"NSMutableArray" 

__compatibilityPopoverController ----- @"UIPopoverController" 

__systemProvidedPresentationView ----- @"UIView" 

__systemProvidedPresentationDelegate ----- @"<UIAlertControllerSystemProvidedPresentationDelegate>" 

_systemProvidedGestureRecognizer ----- @"UIGestureRecognizer" 

_coordinatedActionPerformingDelegate ----- @"<UIAlertControllerCoordinatedActionPerforming>" 

__presentationSourceRepresentationView ----- @"UIView" 

_titleMaximumLineCount ----- q 

_titleLineBreakMode ----- q 



 ********** UIAlertController  PropertyList ****************

hash ------ TQ,R 

superclass ------ T#,R 

description ------ T@"NSString",R,C 

debugDescription ------ T@"NSString",R,C 

_shouldFlipFrameForShimDismissal ------ TB,V__shouldFlipFrameForShimDismissal 

temporaryAnimationCoordinator ------ T@"_UIAnimationCoordinator",&,N,V_temporaryAnimationCoordinator 

previewInteractionController ------ T@"UIPreviewInteractionController",&,N,G_previewInteractionController,S_setPreviewInteractionController:,V_previewInteractionController 

_visualStyle ------ T@"UIAlertControllerVisualStyle",&,N,S_setVisualStyle:,V__visualStyle 

accessibilityViewControllerForSizing ------ T@"UIViewController",&,N,G_getAccessibilityViewControllerForSizing,S_setAccessibilityViewControllerForSizing:,V_accessibilityViewControllerForSizing 

_actions ------ T@"NSMutableArray",R,V_actions 

indexesOfActionSectionSeparators ------ T@"NSIndexSet",C,N,G_indexesOfActionSectionSeparators,S_setIndexesOfActionSectionSeparators:,V_indexesOfActionSectionSeparators 

_cancelAction ------ T@"UIAlertAction",R,V_cancelAction 

_focusedAction ------ T@"UIAlertAction",R 

_actionDelimiterIndices ------ T@"NSMutableArray",R,V__actionDelimiterIndices 

_foregroundView ------ T@"UIView",R 

_dimmingView ------ T@"UIView",R 

_resolvedStyle ------ Tq,R,V_resolvedStyle 

_shouldProvideDimmingView ------ TB,R 

_shouldAlignToKeyboard ------ TB,R 

_hidden ------ TB,N,G_isHidden,S_setHidden:,V_hidden 

effectAlpha ------ Td,N,G_effectAlpha,S_setEffectAlpha: 

_shouldAllowNilParameters ------ TB,S_setShouldAllowNilParameters:,V__shouldAllowNilParameters 

_compatibilityPopoverController ------ T@"UIPopoverController",N,S_setCompatibilityPopoverController:,V__compatibilityPopoverController 

_textFieldViewController ------ T@"_UIAlertControllerTextFieldViewController",R 

_textFieldsHidden ------ TB,S_setTextFieldsHidden: 

hasPreservedInputViews ------ TB,N,G_hasPreservedInputViews,S_setHasPreservedInputViews:,V_hasPreservedInputViews 

_systemProvidedPresentationView ------ T@"UIView",&,N,S_setSystemProvidedPresentationView:,V__systemProvidedPresentationView 

_systemProvidedPresentationDelegate ------ T@"<UIAlertControllerSystemProvidedPresentationDelegate>",&,N,S_setSystemProvidedPresentationDelegate:,V__systemProvidedPresentationDelegate 

systemProvidedGestureRecognizer ------ T@"UIGestureRecognizer",&,N,G_systemProvidedGestureRecognizer,S_setSystemProvidedGestureRecognizer:,V_systemProvidedGestureRecognizer 

_attributedDetailMessage ------ T@"NSAttributedString",C,N,G_attributedDetailMessage,S_setAttributedDetailMessage: 

styleProvider ------ T@"NSObject<UIAlertControllerVisualStyleProviding>",W,N,G_styleProvider,S_setStyleProvider:,V_styleProvider 

coordinatedActionPerformingDelegate ------ T@"<UIAlertControllerCoordinatedActionPerforming>",W,N,V_coordinatedActionPerformingDelegate 

_presentationSourceRepresentationView ------ T@"UIView",&,N,S_setPresentationSourceRepresentationView:,V__presentationSourceRepresentationView 

_shouldReverseActions ------ TB,R 

_headerContentViewController ------ T@"UIViewController",&,N,S_setHeaderContentViewController:,V_headerContentViewController 

contentViewController ------ T@"UIViewController",&,N 

preferredStyle ------ Tq,N 

titleMaximumLineCount ------ Tq,N,G_titleMaximumLineCount,S_setTitleMaximumLineCount:,V_titleMaximumLineCount 

titleLineBreakMode ------ Tq,N,G_titleLineBreakMode,S_setTitleLineBreakMode:,V_titleLineBreakMode 

attributedTitle ------ T@"NSAttributedString",C,N,G_attributedTitle,S_setAttributedTitle: 

attributedMessage ------ T@"NSAttributedString",C,N,G_attributedMessage,S_setAttributedMessage: 

actions ------ T@"NSArray",&,N,S_setActions: 

preferredAction ------ T@"UIAlertAction",&,N,V_preferredAction 

textFields ------ T@"NSArray",R,N 

title ------ T@"NSString",C,D,N 

message ------ T@"NSString",C,N 

hash ------ TQ,R 

superclass ------ T#,R 

description ------ T@"NSString",R,C 

debugDescription ------ T@"NSString",R,C