Add validation block

README.md

@@ -62,6 +62,15 @@ alert.attributedFormatBlock = ^NSAttributedString* (NSString *value)
     NSLog(@"Second button tapped");
 }];
 
+//Using Blocks With Validation
+[alert addButton:@"Validate" validationBlock:^BOOL {
+	BOOL passedValidation = ....
+	return passedValidation;
+
+} actionBlock:^{
+	// handle successful validation here
+}];
+
 //Dismiss on tap outside (Default is NO)
 alert.shouldDismissOnTapOutside = YES;
 

SCLAlertView/SCLAlertView.h

@@ -94,6 +94,14 @@ typedef NS_ENUM(NSInteger, SCLAlertViewAnimation)
  */
 - (SCLButton *)addButton:(NSString *)title actionBlock:(ActionBlock)action;
 
+/** Add a Button with a title, a block to handle validation, and a block to handle when the button is pressed and validation succeeds.
+ *
+ * @param title The text displayed on the button.
+ * @param validationBlock A block of code that will allow you to validate fields or do any other logic you may want to do to determine if the alert should be dismissed or not. Inside of this block, return a BOOL indicating whether or not the action block should be called and the alert dismissed.
+ * @param actionBlock A block of code to be executed when the button is pressed and validation passes.
+ */
+- (SCLButton *)addButton:(NSString *)title validationBlock:(ValidationBlock)validationBlock actionBlock:(ActionBlock)action;
+
 /** Add Button
  *
  * TODO

SCLAlertView/SCLAlertView.m

@@ -323,6 +323,13 @@ - (SCLButton *)addButton:(NSString *)title actionBlock:(ActionBlock)action
     return btn;
 }
 
+- (SCLButton *)addButton:(NSString *)title validationBlock:(ValidationBlock)validationBlock actionBlock:(ActionBlock)action
+{
+    SCLButton *btn = [self addButton:title actionBlock:action];
+    btn.validationBlock = validationBlock;
+
+    return btn;
+}
 
 - (SCLButton *)addButton:(NSString *)title target:(id)target selector:(SEL)selector
 {
@@ -337,6 +344,11 @@ - (SCLButton *)addButton:(NSString *)title target:(id)target selector:(SEL)selec
 
 - (void)buttonTapped:(SCLButton *)btn
 {
+    // If the button has a validation block, and the validation block returns NO, validation
+    // failed, so we should bail.
+    if (btn.validationBlock && btn.validationBlock() == NO) {
+        return;
+    }
     if (btn.actionType == Block)
     {
         if (btn.actionBlock)

SCLAlertView/SCLButton.h

@@ -11,6 +11,7 @@
 @interface SCLButton : UIButton
 
 typedef void (^ActionBlock)(void);
+typedef BOOL (^ValidationBlock)(void);
 
 // Action Types
 typedef NS_ENUM(NSInteger, SCLActionType)
@@ -24,6 +25,7 @@ typedef NS_ENUM(NSInteger, SCLActionType)
 @property SCLActionType actionType;
 
 @property (nonatomic, copy) ActionBlock actionBlock;
+@property (nonatomic, copy) ValidationBlock validationBlock;
 
 @property id target;
 

SCLAlertViewExample/Base.lproj/Storyboard.storyboard

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6245" systemVersion="13F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="Ohq-jH-G4R">
     <dependencies>
-        <deployment defaultVersion="1792" identifier="iOS"/>
         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238"/>
     </dependencies>
     <scenes>
@@ -98,6 +97,15 @@
                                     <action selector="showCustom:" destination="Ohq-jH-G4R" eventType="touchUpInside" id="m4v-4B-1YQ"/>
                                 </connections>
                             </button>
+                            <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="XBG-LD-1eZ">
+                                <rect key="frame" x="88" y="466" width="143" height="30"/>
+                                <state key="normal" title="Show Validation">
+                                    <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
+                                </state>
+                                <connections>
+                                    <action selector="showValidation:" destination="Ohq-jH-G4R" eventType="touchUpInside" id="1DV-xd-ugz"/>
+                                </connections>
+                            </button>
                         </subviews>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                     </view>

SCLAlertViewExample/ViewController.h

@@ -17,6 +17,7 @@
 - (IBAction)showInfo:(id)sender;
 - (IBAction)showEdit:(id)sender;
 - (IBAction)showCustom:(id)sender;
+- (IBAction)showValidation:(id)sender;
 
 @end
 

SCLAlertViewExample/ViewController.m

@@ -143,6 +143,55 @@ - (IBAction)showCustom:(id)sender {
     [alert showCustom:self image:[UIImage imageNamed:@"git"] color:color title:@"Custom" subTitle:@"Add a custom icon and color for your own type of alert!" closeButtonTitle:@"OK" duration:0.0f];
 }
 
+- (IBAction)showValidation:(id)sender {
+    SCLAlertView *alert = [[SCLAlertView alloc] init];
+
+    UITextField *evenField = [alert addTextField:@"Enter an even number"];
+    evenField.keyboardType = UIKeyboardTypeNumberPad;
+
+    UITextField *oddField = [alert addTextField:@"Enter an odd number"];
+    oddField.keyboardType = UIKeyboardTypeNumberPad;
+
+    [alert addButton:@"Test Validation" validationBlock:^BOOL{
+        if (evenField.text.length == 0) {
+            [[[UIAlertView alloc] initWithTitle:@"Whoops!" message:@"You forgot to add an even number." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
+            [evenField becomeFirstResponder];
+            return NO;
+        }
+
+        if (oddField.text.length == 0) {
+            [[[UIAlertView alloc] initWithTitle:@"Whoops!" message:@"You forgot to add an odd number." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
+            [oddField becomeFirstResponder];
+            return NO;
+        }
+
+        NSInteger evenFieldEntry = [evenField.text integerValue];
+        BOOL evenFieldPassedValidation = evenFieldEntry % 2 == 0;
+
+        if (!evenFieldPassedValidation) {
+            [[[UIAlertView alloc] initWithTitle:@"Whoops!" message:@"That is not an even number." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
+            [evenField becomeFirstResponder];
+            return NO;
+        }
+
+        NSInteger oddFieldEntry = [oddField.text integerValue];
+        BOOL oddFieldPassedValidation = oddFieldEntry % 2 == 1;
+
+        if (!oddFieldPassedValidation) {
+            [[[UIAlertView alloc] initWithTitle:@"Whoops!" message:@"That is not an odd number." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
+            [oddField becomeFirstResponder];
+            return NO;
+        }
+
+        return YES;
+
+    } actionBlock:^{
+        [[[UIAlertView alloc] initWithTitle:@"Great Job!" message:@"Thanks for playing." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
+    }];
+
+    [alert showEdit:self title:@"Validation" subTitle:@"Ensure the data is correct before dismissing!" closeButtonTitle:@"Cancel" duration:0];
+}
+
 - (void)firstButton
 {
     NSLog(@"First button tapped");