Initial demo project

Author: sunnyxx

Classes/FDTextFeedCell.h

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+//
+//  FDTextFeedCell.h
+//  Demo
+//
+//  Created by sunnyxx on 15/4/16.
+//  Copyright (c) 2015年 forkingdog. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface FDTextFeedCell : UITableViewCell
+
+@end

Classes/UITableView+FDTemplateLayoutCell.h

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+// The MIT License (MIT)
+//
+// Copyright (c) 2015-1016 forkingdog ( https://github.com/forkingdog )
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#import <UIKit/UIKit.h>
+
+@interface UITableView (FDTemplateLayoutCell)
+
+- (CGFloat)fd_heightForCellWithIdentifier:(NSString *)identifier configuration:(void (^)(id cell))configuration;
+
+@end
+

Classes/UITableView+FDTemplateLayoutCell.m

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+// The MIT License (MIT)
+//
+// Copyright (c) 2015-1016 forkingdog ( https://github.com/forkingdog )
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#import "UITableView+FDTemplateLayoutCell.h"
+#import <objc/runtime.h>
+
+@implementation UITableView (FDTemplateLayoutCell)
+
+- (id)fd_templateCellForReuseIdentifier:(NSString *)identifier;
+{
+    NSAssert(identifier.length > 0, @"Expect a valid identifier - %@", identifier);
+    
+    NSMutableDictionary *templateCellsByIdentifiers = objc_getAssociatedObject(self, _cmd);
+    if (!templateCellsByIdentifiers) {
+        templateCellsByIdentifiers = @{}.mutableCopy;
+        objc_setAssociatedObject(self, _cmd, templateCellsByIdentifiers, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    }
+    
+    UITableViewCell *templateCell = templateCellsByIdentifiers[identifier];
+    if (!templateCell) {
+        templateCell = [self dequeueReusableCellWithIdentifier:identifier];
+        templateCellsByIdentifiers[identifier] = templateCell;
+    }
+    
+    return templateCell;
+}
+
+- (CGFloat)fd_heightForCellWithIdentifier:(NSString *)identifier configuration:(void (^)(id))configuration
+{
+    // Fetch a cached template cell for indentifier
+    UITableViewCell *cell = [self fd_templateCellForReuseIdentifier:identifier];
+    
+    // Reset to default
+    cell.contentView.bounds = CGRectMake(0, 0, CGRectGetWidth(self.frame), self.rowHeight);
+    
+    // Keep what real cells do
+    [cell prepareForReuse];
+    
+    // Configure our template cell
+    if (configuration) {
+        configuration(cell);
+    }
+    
+    // TODO: What's this fucking temp constraint?
+    NSLayoutConstraint *tempWidthConstraint =
+    [NSLayoutConstraint constraintWithItem:cell.contentView
+                                 attribute:NSLayoutAttributeWidth
+                                 relatedBy:NSLayoutRelationEqual
+                                    toItem:nil
+                                 attribute:NSLayoutAttributeNotAnAttribute
+                                multiplier:1.0
+                                  constant:CGRectGetWidth(self.frame)];
+    [cell.contentView addConstraint:tempWidthConstraint];
+    
+    // Auto layout system does its math
+    CGSize fittingSize = [cell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
+    
+    [cell.contentView removeConstraint:tempWidthConstraint];
+    
+    // Add 1px for separator line if needed, screen scale respected
+    if (self.separatorStyle != UITableViewCellSeparatorStyleNone) {
+        fittingSize.height += 1.0 / [UIScreen mainScreen].scale;
+    }
+    
+    return fittingSize.height;
+}
+
+@end