make font of picker label ready for customize.

Example Projects/ObjC-Example/Example/Classes/ActionSheetPickerTableViewController.m

@@ -251,7 +251,10 @@ - (IBAction)customButtons:(id)sender {
 - (IBAction)customBackgroundAndText:(id)sender {
     ActionSheetStringPicker *picker = [[ActionSheetStringPicker alloc] initWithTitle:@"" rows:@[@"choiceA", @"choiceB", @"choiceC"] initialSelection:1 doneBlock:nil cancelBlock:nil origin:sender];
     picker.pickerBackgroundColor = [UIColor blackColor];
+    NSMutableParagraphStyle *labelParagraphStyle = [[NSMutableParagraphStyle alloc] init];
+    labelParagraphStyle.alignment = NSTextAlignmentCenter;
     picker.pickerTextAttributes = @{NSForegroundColorAttributeName: [UIColor whiteColor],
+                                    NSParagraphStyleAttributeName: labelParagraphStyle,
                                     NSFontAttributeName:[self getRandomFont],};
     [picker showActionSheetPicker];
 }
@@ -262,6 +265,9 @@ - (UIFont *)getRandomFont
     NSArray *familyNames = [UIFont familyNames];
     NSString *familyName = familyNames[arc4random() % [familyNames count]];
     NSArray *namesForFamilyName = [UIFont fontNamesForFamilyName:familyName];
+    if ([namesForFamilyName count] == 0) {
+        return [self getRandomFont];
+    }
     NSString *fontName = namesForFamilyName[arc4random() % [namesForFamilyName count]];
     UIFont *randomFont = [UIFont fontWithName:fontName size:[UIFont systemFontSize]];
     return randomFont;

Pickers/AbstractActionSheetPicker.h

@@ -75,7 +75,7 @@ static NSString *const kActionTarget  = @"buttonActionTarget";
 @property (nonatomic, assign) CGRect presentFromRect;
 @property (nonatomic) NSDictionary *titleTextAttributes; // default is nil. Used to specify Title Label attributes.
 @property (nonatomic) NSAttributedString *attributedTitle; // default is nil. If titleTextAttributes not nil this value ignored.
-@property (nonatomic) NSDictionary *pickerTextAttributes; // default is nil. Used to specify Picker Label attributes.
+@property (nonatomic) NSDictionary *pickerTextAttributes; // default with a NSMutableParagraphStyle to set label align center. Used to specify Picker Label attributes.
 @property (nonatomic) UIColor *pickerBackgroundColor;
 @property (nonatomic, retain) Class popoverBackgroundViewClass; //allow popover customization on iPad
 @property (nonatomic) UIInterfaceOrientationMask supportedInterfaceOrientations; // You can set your own supportedInterfaceOrientations value to prevent dismissing picker in some special cases.

Pickers/AbstractActionSheetPicker.m

@@ -158,6 +158,10 @@ - (instancetype)init {
         self.tapDismissAction = TapActionNone;
         //allows us to use this without needing to store a reference in calling class
         self.selfReference = self;
+
+        NSMutableParagraphStyle *labelParagraphStyle = [[NSMutableParagraphStyle alloc] init];
+        labelParagraphStyle.alignment = NSTextAlignmentCenter;
+        self.pickerTextAttributes = @{NSParagraphStyleAttributeName: labelParagraphStyle};
     }
 
     return self;

Pickers/ActionSheetStringPicker.m

@@ -163,6 +163,30 @@ - (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleFor
     return nil;
 }
 
+- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
+    id obj = (self.data)[(NSUInteger) row];
+    UILabel *pickerLabel = (UILabel *)view;
+    if (pickerLabel == nil) {
+        pickerLabel = [[UILabel alloc] init];
+    }
+    NSAttributedString *attributeTitle = nil;
+    // return the object if it is already a NSString,
+    // otherwise, return the description, just like the toString() method in Java
+    // else, return nil to prevent exception
+
+    if ([obj isKindOfClass:[NSString class]])
+        attributeTitle = [[NSAttributedString alloc] initWithString:obj attributes:self.pickerTextAttributes];
+
+    if ([obj respondsToSelector:@selector(description)])
+        attributeTitle = [[NSAttributedString alloc] initWithString:[obj performSelector:@selector(description)] attributes:self.pickerTextAttributes];
+
+    if (attributeTitle != nil) {
+        pickerLabel.attributedText = attributeTitle;
+        return pickerLabel;
+    }
+    return nil;
+}
+
 - (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
     return pickerView.frame.size.width - 30;
 }