Create Flat UI rounded button class.

// FREEBIE

Signal/src/ViewControllers/CodeVerificationViewController.m

@@ -156,6 +156,8 @@ NS_ASSUME_NONNULL_BEGIN
     [underscoreView autoSetDimension:ALDimensionHeight toSize:1.f];
 
     const CGFloat kSubmitButtonHeight = 47.f;
+    // NOTE: We use ows_signalBrandBlueColor instead of ows_materialBlueColor
+    //       throughout the onboarding flow to be consistent with the headers.
     OWSFlatButton *submitButton =
         [OWSFlatButton buttonWithTitle:NSLocalizedString(@"VERIFICATION_CHALLENGE_SUBMIT_CODE",
                                            @"button text during registration to submit your SMS verification code.")

Signal/src/ViewControllers/ProfileViewController.m

@@ -38,7 +38,7 @@ NSString *const kProfileView_LastPresentedDate = @"kProfileView_LastPresentedDat
 
 @property (nonatomic) UIImageView *cameraImageView;
 
-@property (nonatomic) UIButton *saveButton;
+@property (nonatomic) OWSFlatButton *saveButton;
 
 @property (nonatomic, nullable) UIImage *avatar;
 
@@ -209,21 +209,22 @@ NSString *const kProfileView_LastPresentedDate = @"kProfileView_LastPresentedDat
         UIView *buttonRow = [UIView containerView];
         [rows addObject:buttonRow];
 
-        UIButton *saveButton = [UIButton buttonWithType:UIButtonTypeCustom];
+        const CGFloat kButtonHeight = 47.f;
+        // NOTE: We use ows_signalBrandBlueColor instead of ows_materialBlueColor
+        //       throughout the onboarding flow to be consistent with the headers.
+        OWSFlatButton *saveButton =
+            [OWSFlatButton buttonWithTitle:NSLocalizedString(@"PROFILE_VIEW_SAVE_BUTTON",
+                                               @"Button to save the profile view in the profile view.")
+                                      font:[OWSFlatButton fontForHeight:kButtonHeight]
+                                titleColor:[UIColor whiteColor]
+                           backgroundColor:[UIColor ows_signalBrandBlueColor]
+                                    target:self
+                                  selector:@selector(saveButtonPressed)];
         self.saveButton = saveButton;
-        saveButton.backgroundColor = [UIColor ows_signalBrandBlueColor];
-        [saveButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
-        saveButton.titleLabel.font = [UIFont ows_boldFontWithSize:fontSizePoints];
-        [saveButton setTitle:NSLocalizedString(
-                                 @"PROFILE_VIEW_SAVE_BUTTON", @"Button to save the profile view in the profile view.")
-                    forState:UIControlStateNormal];
-        [saveButton setContentHorizontalAlignment:UIControlContentHorizontalAlignmentCenter];
-        [saveButton setContentVerticalAlignment:UIControlContentVerticalAlignmentCenter];
         [buttonRow addSubview:saveButton];
         [saveButton autoPinLeadingAndTrailingToSuperview];
         [saveButton autoPinHeightToSuperview];
         [saveButton autoSetDimension:ALDimensionHeight toSize:47.f];
-        [saveButton addTarget:self action:@selector(saveButtonPressed) forControlEvents:UIControlEventTouchUpInside];
     }
 
     // Row Layout
@@ -345,11 +346,11 @@ NSString *const kProfileView_LastPresentedDate = @"kProfileView_LastPresentedDat
     // The save button is only used in "registration" and "upgrade or nag" modes.
     if (self.hasUnsavedChanges) {
         self.saveButton.enabled = YES;
-        self.saveButton.backgroundColor = [UIColor ows_signalBrandBlueColor];
+        [self.saveButton setBackgroundColors:[UIColor ows_signalBrandBlueColor]];
     } else {
         self.saveButton.enabled = NO;
-        self.saveButton.backgroundColor =
-            [[UIColor ows_signalBrandBlueColor] blendWithColor:[UIColor whiteColor] alpha:0.5f];
+        [self.saveButton
+            setBackgroundColors:[[UIColor ows_signalBrandBlueColor] blendWithColor:[UIColor whiteColor] alpha:0.5f]];
     }
 }
 

Signal/src/ViewControllers/RegistrationViewController.m

@@ -199,6 +199,8 @@ NSString *const kKeychainKey_LastRegisteredPhoneNumber = @"kKeychainKey_LastRegi
 
     // Activate Button
     const CGFloat kActivateButtonHeight = 47.f;
+    // NOTE: We use ows_signalBrandBlueColor instead of ows_materialBlueColor
+    //       throughout the onboarding flow to be consistent with the headers.
     OWSFlatButton *activateButton = [OWSFlatButton buttonWithTitle:NSLocalizedString(@"REGISTRATION_VERIFY_DEVICE", @"")
                                                               font:[OWSFlatButton fontForHeight:kActivateButtonHeight]
                                                         titleColor:[UIColor whiteColor]

Signal/src/ViewControllers/SelectRecipientViewController.m

@@ -37,7 +37,7 @@ NSString *const kSelectRecipientViewControllerCellIdentifier = @"kSelectRecipien
 
 @property (nonatomic) UITextField *phoneNumberTextField;
 
-@property (nonatomic) UIButton *phoneNumberButton;
+@property (nonatomic) OWSFlatButton *phoneNumberButton;
 
 @property (nonatomic) UILabel *examplePhoneNumberLabel;
 
@@ -172,24 +172,19 @@ NSString *const kSelectRecipientViewControllerCellIdentifier = @"kSelectRecipien
     return _phoneNumberTextField;
 }
 
-- (UIButton *)phoneNumberButton
+- (OWSFlatButton *)phoneNumberButton
 {
     if (!_phoneNumberButton) {
-        // TODO: Eventually we should make a view factory that will allow us to
-        //       create views with consistent appearance across the app and move
-        //       towards a "design language."
-        _phoneNumberButton = [UIButton buttonWithType:UIButtonTypeCustom];
-        _phoneNumberButton.titleLabel.font = [UIFont ows_mediumFontWithSize:18.f];
-        [_phoneNumberButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
-        [_phoneNumberButton setBackgroundColor:[UIColor ows_materialBlueColor]];
-        _phoneNumberButton.clipsToBounds = YES;
-        _phoneNumberButton.layer.cornerRadius = 3.f;
-        [_phoneNumberButton setTitle:[self.delegate phoneNumberButtonText] forState:UIControlStateNormal];
-        [_phoneNumberButton addTarget:self
-                               action:@selector(phoneNumberButtonPressed:)
-                     forControlEvents:UIControlEventTouchUpInside];
-        [_phoneNumberButton autoSetDimension:ALDimensionWidth toSize:140];
-        [_phoneNumberButton autoSetDimension:ALDimensionHeight toSize:40];
+        const CGFloat kButtonHeight = 40;
+        OWSFlatButton *button = [OWSFlatButton buttonWithTitle:[self.delegate phoneNumberButtonText]
+                                                          font:[OWSFlatButton fontForHeight:kButtonHeight]
+                                                    titleColor:[UIColor whiteColor]
+                                               backgroundColor:[UIColor ows_materialBlueColor]
+                                                        target:self
+                                                      selector:@selector(phoneNumberButtonPressed)];
+        _phoneNumberButton = button;
+        [button autoSetDimension:ALDimensionWidth toSize:140];
+        [button autoSetDimension:ALDimensionHeight toSize:kButtonHeight];
     }
     return _phoneNumberButton;
 }
@@ -275,7 +270,7 @@ NSString *const kSelectRecipientViewControllerCellIdentifier = @"kSelectRecipien
     [self presentViewController:navigationController animated:YES completion:[UIUtil modalCompletionBlock]];
 }
 
-- (void)phoneNumberButtonPressed:(id)sender
+- (void)phoneNumberButtonPressed
 {
     [self tryToSelectPhoneNumber];
 }
@@ -387,7 +382,7 @@ NSString *const kSelectRecipientViewControllerCellIdentifier = @"kSelectRecipien
     BOOL isEnabled = [self hasValidPhoneNumber];
     self.phoneNumberButton.enabled = isEnabled;
     [self.phoneNumberButton
-        setBackgroundColor:(isEnabled ? [UIColor ows_signalBrandBlueColor] : [UIColor lightGrayColor])];
+        setBackgroundColors:(isEnabled ? [UIColor ows_signalBrandBlueColor] : [UIColor lightGrayColor])];
 }
 
 #pragma mark - CountryCodeViewControllerDelegate