alexleutgoeb · 0xMarK · Nov 19, 2012 · Nov 20, 2012
diff --git a/Classes/ALPickerView.h b/Classes/ALPickerView.h
@@ -67,5 +67,7 @@
 - (void)pickerView:(ALPickerView *)pickerView didCheckRow:(NSInteger)row;
 // Inform the delegate that a row got deselected, if row = -1 all rows are deselected
 - (void)pickerView:(ALPickerView *)pickerView didUncheckRow:(NSInteger)row;
+// Return a boolean read-only state on the given row
+- (BOOL)pickerView:(ALPickerView *)pickerView readOnlyStateForRow:(NSInteger)row;
 
 @end
diff --git a/Classes/ALPickerView.m b/Classes/ALPickerView.m
@@ -139,13 +139,20 @@ - (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(
         }
       }
       cell.selectionState = allSelected;
+      cell.readOnlyState = NO;
     }
     else {
       int actualRow = indexPath.row - (allOptionTitle ? 3 : 2);
       cell.textLabel.text = [delegate_ pickerView:self textForRow:actualRow];
       cell.selectionState = [delegate_ pickerView:self selectionStateForRow:actualRow];
+      if (delegate_ && [delegate_ respondsToSelector:@selector(pickerView:readOnlyStateForRow:)]) {
+        cell.readOnlyState = [delegate_ pickerView:self readOnlyStateForRow:actualRow];
+      }
     }
-    cell.selectionStyle = UITableViewCellSelectionStyleBlue;
+    if (cell.readOnlyState)
+      cell.selectionStyle = UITableViewCellSelectionStyleNone;
+    else
+      cell.selectionStyle = UITableViewCellSelectionStyleBlue;
   }
 
   return cell;
@@ -200,6 +207,19 @@ - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath
 }
 
 
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
+  ALPickerViewCell *cell = (ALPickerViewCell *)[tableView cellForRowAtIndexPath:indexPath];
+  int actualRow = indexPath.row - (allOptionTitle ? 3 : 2);
+  if (!cell.readOnlyState || (allOptionTitle && actualRow == -1)) {
+    return indexPath;
+  }
+  else {
+    return nil;
+  }
+}
+
+
 #pragma mark - ScrollView
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

diff --git a/Classes/ALPickerViewCell.h b/Classes/ALPickerViewCell.h
@@ -31,10 +31,12 @@
 
 @interface ALPickerViewCell : UITableViewCell {
 @private
-  BOOL selectionState_;
+    BOOL selectionState_;
+    BOOL readOnlyState_;
 }
 
 @property (nonatomic, assign) BOOL selectionState;
+@property (nonatomic, assign) BOOL readOnlyState;
 
 - (id)initWithReuseIdentifier:(NSString *)reuseIdentifier;
 

diff --git a/Classes/ALPickerViewCell.m b/Classes/ALPickerViewCell.m
@@ -35,6 +35,7 @@ @implementation ALPickerViewCell
 - (id)initWithReuseIdentifier:(NSString *)reuseIdentifier {
   if ((self = [super initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier])) {
     selectionState_ = NO;
+    readOnlyState_ = NO;
     self.textLabel.font = [UIFont boldSystemFontOfSize:21];
   }
   return self;
@@ -60,15 +61,28 @@ - (BOOL)selectionState {
 - (void)setSelectionState:(BOOL)selectionState {
   selectionState_ = selectionState;
 
-  if (selectionState_ != NO) {
-    self.imageView.image = [UIImage imageNamed:@"check"];
-    self.imageView.highlightedImage = [UIImage imageNamed:@"check_selected"];
-    self.textLabel.textColor = [UIColor colorWithRed:33/256. green:80/256. blue:134/256. alpha:1];
+  if (readOnlyState_) {
+    if (selectionState_) {
+      self.imageView.image = [UIImage imageNamed:@"check_disabled"];
+      self.imageView.highlightedImage = [UIImage imageNamed:@"check_selected"];
+    }
+    else {
+      self.imageView.image = nil;
+      self.imageView.highlightedImage = nil;
+    }
+    self.textLabel.textColor = [UIColor colorWithRed:153/256. green:153/256. blue:153/256. alpha:1];
   }
   else {
-    self.imageView.image = nil;
-    self.imageView.highlightedImage = nil;
-    self.textLabel.textColor = [UIColor blackColor];
+    if (selectionState_) {
+      self.imageView.image = [UIImage imageNamed:@"check"];
+      self.imageView.highlightedImage = [UIImage imageNamed:@"check_selected"];
+      self.textLabel.textColor = [UIColor colorWithRed:33/256. green:80/256. blue:134/256. alpha:1];
+    }
+    else {
+      self.imageView.image = nil;
+      self.imageView.highlightedImage = nil;
+      self.textLabel.textColor = [UIColor blackColor];
+    }
   }
 
   [self.imageView setNeedsDisplay];
@@ -77,6 +91,45 @@ - (void)setSelectionState:(BOOL)selectionState {
 }
 
 
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+- (BOOL)readOnlyState {
+    return readOnlyState_;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+- (void)setReadOnlyState:(BOOL)readOnlyState {
+  readOnlyState_ = readOnlyState;
+
+  if (readOnlyState_) {
+    if (selectionState_) {
+      self.imageView.image = [UIImage imageNamed:@"check_disabled"];
+      self.imageView.highlightedImage = [UIImage imageNamed:@"check_selected"];
+    }
+    else {
+      self.imageView.image = nil;
+      self.imageView.highlightedImage = nil;
+    }
+    self.textLabel.textColor = [UIColor colorWithRed:153/256. green:153/256. blue:153/256. alpha:1];
+  }
+  else {
+    if (selectionState_) {
+      self.imageView.image = [UIImage imageNamed:@"check"];
+      self.imageView.highlightedImage = [UIImage imageNamed:@"check_selected"];
+      self.textLabel.textColor = [UIColor colorWithRed:33/256. green:80/256. blue:134/256. alpha:1];
+    }
+    else {
+      self.imageView.image = nil;
+      self.imageView.highlightedImage = nil;
+      self.textLabel.textColor = [UIColor blackColor];
+    }
+  }
+
+  [self.textLabel setNeedsDisplay];
+  [self setNeedsLayout];
+}
+
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 - (void)layoutSubviews {
   [super layoutSubviews];

diff --git a/Demo/Classes/DemoViewController.h b/Demo/Classes/DemoViewController.h
@@ -13,6 +13,7 @@
 @interface DemoViewController : UIViewController <ALPickerViewDelegate> {
 	NSArray *entries;
 	NSMutableDictionary *selectionStates;
+	NSMutableDictionary *readOnlyStates;
 
 	ALPickerView *pickerView;
 }

diff --git a/Demo/Classes/DemoViewController.m b/Demo/Classes/DemoViewController.m
@@ -17,19 +17,28 @@ - (void)viewDidLoad {
 
 	// Create some sample data
 	entries = [[NSArray alloc] initWithObjects:@"Row 1", @"Row 2", @"Row 3", @"Row 4", @"Row 5", nil];
+
+	readOnlyStates = [[NSMutableDictionary alloc] init];
+	for (NSString *key in entries)
+        if ([key isEqualToString:@"Row 2"] || [key isEqualToString:@"Row 4"])
+            [readOnlyStates setObject:[NSNumber numberWithBool:YES] forKey:key];
+        else
+            [readOnlyStates setObject:[NSNumber numberWithBool:NO] forKey:key];
+
 	selectionStates = [[NSMutableDictionary alloc] init];
 	for (NSString *key in entries)
-		[selectionStates setObject:[NSNumber numberWithBool:NO] forKey:key];
+		[selectionStates setObject:[NSNumber numberWithBool:YES] forKey:key];
 
 	// Init picker and add it to view
 	pickerView = [[ALPickerView alloc] initWithFrame:CGRectMake(0, 244, 0, 0)];
 	pickerView.delegate = self;
-	[self.view addSubview:pickerView];	
+	[self.view addSubview:pickerView];
 }
 
 - (void)dealloc {
 	[pickerView release];
 
+	[readOnlyStates release];
 	[selectionStates release];
 	[entries release];
     [super dealloc];
@@ -51,20 +60,30 @@ - (BOOL)pickerView:(ALPickerView *)pickerView selectionStateForRow:(NSInteger)ro
 	return [[selectionStates objectForKey:[entries objectAtIndex:row]] boolValue];
 }
 
+- (BOOL)pickerView:(ALPickerView *)pickerView readOnlyStateForRow:(NSInteger)row {
+	return [[readOnlyStates objectForKey:[entries objectAtIndex:row]] boolValue];
+}
+
 - (void)pickerView:(ALPickerView *)pickerView didCheckRow:(NSInteger)row {
 	// Check whether all rows are checked or only one
 	if (row == -1)
-		for (id key in [selectionStates allKeys])
-			[selectionStates setObject:[NSNumber numberWithBool:YES] forKey:key];
+		for (id key in [selectionStates allKeys]) {
+            if (![[readOnlyStates objectForKey:key] boolValue]) {
+                [selectionStates setObject:[NSNumber numberWithBool:YES] forKey:key];
+            }
+        }
 	else
 		[selectionStates setObject:[NSNumber numberWithBool:YES] forKey:[entries objectAtIndex:row]];
 }
 
 - (void)pickerView:(ALPickerView *)pickerView didUncheckRow:(NSInteger)row {
 	// Check whether all rows are unchecked or only one
 	if (row == -1)
-		for (id key in [selectionStates allKeys])
-			[selectionStates setObject:[NSNumber numberWithBool:NO] forKey:key];
+		for (id key in [selectionStates allKeys]) {
+            if (![[readOnlyStates objectForKey:key] boolValue]) {
+                [selectionStates setObject:[NSNumber numberWithBool:NO] forKey:key];
+            }
+        }
 	else
 		[selectionStates setObject:[NSNumber numberWithBool:NO] forKey:[entries objectAtIndex:row]];
 }

diff --git a/Demo/Demo.xcodeproj/project.pbxproj b/Demo/Demo.xcodeproj/project.pbxproj
@@ -15,6 +15,7 @@
 		2899E5220DE3E06400AC0155 /* DemoViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 2899E5210DE3E06400AC0155 /* DemoViewController.xib */; };
 		28AD733F0D9D9553002E5188 /* MainWindow.xib in Resources */ = {isa = PBXBuildFile; fileRef = 28AD733E0D9D9553002E5188 /* MainWindow.xib */; };
 		28D7ACF80DDB3853001CB0EB /* DemoViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 28D7ACF70DDB3853001CB0EB /* DemoViewController.m */; };
+		4D3401D1164D79D200EDD9D7 /* check_disabled@2x.png in Resources */ = {isa = PBXBuildFile; fileRef = 4D3401D0164D79D200EDD9D7 /* check_disabled@2x.png */; };
 		FA36CA2112E4DABB00A49F9F /* ALPickerView.m in Sources */ = {isa = PBXBuildFile; fileRef = FA36CA1C12E4DABB00A49F9F /* ALPickerView.m */; };
 		FA8EA5EA146EC91100CCACA3 /* ALPickerViewCell.m in Sources */ = {isa = PBXBuildFile; fileRef = FA8EA5E9146EC91100CCACA3 /* ALPickerViewCell.m */; };
 		FA8EA60A146EDEF300CCACA3 /* check@2x.png in Resources */ = {isa = PBXBuildFile; fileRef = FA8EA5EB146EC92A00CCACA3 /* check@2x.png */; };
@@ -39,6 +40,7 @@
 		28D7ACF70DDB3853001CB0EB /* DemoViewController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = DemoViewController.m; sourceTree = "<group>"; };
 		29B97316FDCFA39411CA2CEA /* main.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = main.m; sourceTree = "<group>"; };
 		32CA4F630368D1EE00C91783 /* Demo_Prefix.pch */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Demo_Prefix.pch; sourceTree = "<group>"; };
+		4D3401D0164D79D200EDD9D7 /* check_disabled@2x.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; name = "check_disabled@2x.png"; path = "../ImageRes/check_disabled@2x.png"; sourceTree = "<group>"; };
 		8D1107310486CEB800E47090 /* Demo-Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = "Demo-Info.plist"; plistStructureDefinitionIdentifier = "com.apple.xcode.plist.structure-definition.iphone.info-plist"; sourceTree = "<group>"; };
 		FA36CA1B12E4DABB00A49F9F /* ALPickerView.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = ALPickerView.h; path = ../Classes/ALPickerView.h; sourceTree = SOURCE_ROOT; };
 		FA36CA1C12E4DABB00A49F9F /* ALPickerView.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = ALPickerView.m; path = ../Classes/ALPickerView.m; sourceTree = SOURCE_ROOT; };
@@ -113,6 +115,7 @@
 			children = (
 				FA8EA5EB146EC92A00CCACA3 /* check@2x.png */,
 				FA8EA5EC146EC92A00CCACA3 /* check_selected@2x.png */,
+				4D3401D0164D79D200EDD9D7 /* check_disabled@2x.png */,
 				FA8EA5ED146EC92A00CCACA3 /* frame_left@2x.png */,
 				FA8EA5EE146EC92A00CCACA3 /* frame_middle@2x.png */,
 				FA8EA5EF146EC92A00CCACA3 /* frame_right@2x.png */,
@@ -207,6 +210,7 @@
 				FA8EA60E146EDEF300CCACA3 /* frame_right@2x.png in Resources */,
 				FA8EA60F146EDEF300CCACA3 /* wheel_shadow@2x.png in Resources */,
 				FA8EA610146EDEF300CCACA3 /* wheel_bg@2x.png in Resources */,
+				4D3401D1164D79D200EDD9D7 /* check_disabled@2x.png in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

diff --git a/ImageRes/check_disabled@2x.png b/ImageRes/check_disabled@2x.png