add fallback method since attributedTitleForRow is not availiable in …

…iOS5.

Pickers/ActionSheetStringPicker.m

@@ -131,6 +131,22 @@ - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSIn
     return self.data.count;
 }
 
+- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
+    id obj = (self.data)[(NSUInteger) row];
+
+    // 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]])
+        return obj;
+
+    if ([obj respondsToSelector:@selector(description)])
+        return [obj performSelector:@selector(description)];
+
+    return nil;
+}
+
 - (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component {
     id obj = (self.data)[(NSUInteger) row];