Force frame layout support

Author: sunnyxx

Classes/UITableView+FDTemplateLayoutCell.h

@@ -75,4 +75,13 @@
 ///
 @property (nonatomic, assign) BOOL fd_isTemplateLayoutCell;
 
+/// Enable to enforce this template layout cell to use "frame layout" rather than "auto layout",
+/// and will ask cell's height by calling "-sizeThatFits:", so you must override this method.
+/// Note:
+///   If no layout constraints have been added to cell's content view, it will automatically
+///   switch to "frame layout" mode. Use this property only when you want to manually control
+///   this template layout cell's height calculation mode. Default to NO.
+///
+@property (nonatomic, assign) BOOL fd_enforceFrameLayout;
+
 @end

Classes/UITableView+FDTemplateLayoutCell.m

@@ -437,8 +437,7 @@ - (CGFloat)fd_heightForCellWithIdentifier:(NSString *)identifier configuration:(
     CGSize fittingSize = CGSizeZero;
 
     // If auto layout enabled, cell's contentView must have some constraints.
-    BOOL autoLayoutEnabled = cell.contentView.constraints.count > 0 ? YES : NO;
-    
+    BOOL autoLayoutEnabled = cell.contentView.constraints.count > 0 && !cell.fd_enforceFrameLayout;
     if (autoLayoutEnabled) {
 
         // Add a hard width constraint to make dynamic content views (like labels) expand vertically instead
@@ -462,8 +461,11 @@ - (CGFloat)fd_heightForCellWithIdentifier:(NSString *)identifier configuration:(
         // This is the same method used in iOS8 self-sizing cell's implementation.
         // Note: fitting height should not include separator view.
         SEL selector = @selector(sizeThatFits:);
+        BOOL inherited = ![cell isMemberOfClass:UITableViewCell.class];
         BOOL overrided = [cell.class instanceMethodForSelector:selector] != [UITableViewCell instanceMethodForSelector:selector];
-        NSAssert(overrided, @"Cell must override '-sizeThatFits:' method if not using auto layout.");
+        if (inherited && !overrided) {
+            NSAssert(NO, @"Customized cell must override '-sizeThatFits:' method if not using auto layout.");
+        }
         fittingSize = [cell sizeThatFits:self.frame.size];
     }
 
@@ -548,4 +550,14 @@ - (void)setFd_isTemplateLayoutCell:(BOOL)isTemplateLayoutCell
     objc_setAssociatedObject(self, @selector(fd_isTemplateLayoutCell), @(isTemplateLayoutCell), OBJC_ASSOCIATION_RETAIN);
 }
 
+- (BOOL)fd_enforceFrameLayout
+{
+    return [objc_getAssociatedObject(self, _cmd) boolValue];
+}
+
+- (void)setFd_enforceFrameLayout:(BOOL)enforceFrameLayout
+{
+    objc_setAssociatedObject(self, @selector(fd_enforceFrameLayout), @(enforceFrameLayout), OBJC_ASSOCIATION_RETAIN);
+}
+
 @end

Demo/Demo/FDFeedCell.m

@@ -40,9 +40,15 @@ - (void)setEntity:(FDFeedEntity *)entity
 }
 
 // If you are not using auto layout, override this method
-//- (CGSize)sizeThatFits:(CGSize)size
-//{
-//    return CGSizeMake(size.width, 150);
-//}
+- (CGSize)sizeThatFits:(CGSize)size
+{
+    CGFloat totalHeight = 0;
+    totalHeight += [self.titleLabel sizeThatFits:size].height;
+    totalHeight += [self.contentLabel sizeThatFits:size].height;
+    totalHeight += [self.contentImageView sizeThatFits:size].height;
+    totalHeight += [self.usernameLabel sizeThatFits:size].height;
+    totalHeight += 40; // margins
+    return CGSizeMake(size.width, totalHeight);
+}
 
 @end

Demo/Demo/FDFeedViewController.m

@@ -81,6 +81,7 @@ - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(N
 
 - (void)configureCell:(FDFeedCell *)cell atIndexPath:(NSIndexPath *)indexPath
 {
+    cell.fd_enforceFrameLayout = NO; // Enable to use "-sizeThatFits:"
     cell.entity = self.feedEntitySections[indexPath.section][indexPath.row];
 }
 
@@ -162,6 +163,9 @@ - (FDFeedEntity *)randomEntity
 
 - (void)insertRow
 {
+    if (self.feedEntitySections.count == 0) {
+        self.feedEntitySections[0] = @[].mutableCopy;
+    }
     [self.feedEntitySections[0] insertObject:self.randomEntity atIndex:0];
     NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
     [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];