UITableView-FDTemplateLayoutCell 使用

基本用法

If you have a self-satisfied cell,
then all you have to do is:

#import "UITableView+FDTemplateLayoutCell.h"

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return [tableView fd_heightForCellWithIdentifier:@"reuse identifer" configuration:^(id cell) {
// Configure this cell with data, same as what you've done in "-tableView:cellForRowAtIndexPath:"
// Like:
// cell.entity = self.feedEntities[indexPath.row];
}];
}

高度缓存 API

Since iOS8, 

-tableView:heightForRowAtIndexPath:

 will
be called more times than we expect, we can feel these extra calculations when scrolling. So we provide another API with cache by index path:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return [tableView fd_heightForCellWithIdentifier:@"identifer" cacheByIndexPath:indexPath configuration:^(id cell) {
// configurations
}];
}
Or, if your entity has an unique identifier, use cache by key API:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
Entity *entity = self.entities[indexPath.row];
return [tableView fd_heightForCellWithIdentifier:@"identifer" cacheByKey:entity.uid configuration:^(id cell) {
// configurations
}];
}

布局模型

FDTemplateLayoutCell

 offers
2 modes for asking cell's height.

Auto layout mode using "-systemLayoutSizeFittingSize:"

Frame layout mode using "-sizeThatFits:"
1.Generally, no need to care about modes, it will automatically choose
a proper mode by whether you have set auto layout constrants on cell's content view. 

2.If
you want to enforce frame layout mode, enable this property in your cell's configuration block:

cell.fd_enforceFrameLayout = YES;
And if you're using frame layout mode, you must override 

-sizeThatFits:

 in
your customized cell and return content view's height (separator excluded)
- (CGSize)sizeThatFits:(CGSize)size {
return CGSizeMake(size.width, A+B+C+D+E+....);
}

Debug log

Debug log helps to debug or inspect what is this "FDTemplateLayoutCell" extention
doing, turning on to print logs when "calculating", "precaching" or "hitting cache".Default to "NO", log by "NSLog".

self.tableView.fd_debugLogEnabled = YES;

** FDTemplateLayoutCell ** layout cell created - FDFeedCell
** FDTemplateLayoutCell ** calculate - [0:0] 233.5
** FDTemplateLayoutCell ** calculate - [0:1] 155.5
** FDTemplateLayoutCell ** calculate - [0:2] 258
** FDTemplateLayoutCell ** calculate - [0:3] 284
** FDTemplateLayoutCell ** precached - [0:3] 284
** FDTemplateLayoutCell ** calculate - [0:4] 278.5
** FDTemplateLayoutCell ** precached - [0:4] 278.5
** FDTemplateLayoutCell ** hit cache - [0:3] 284
** FDTemplateLayoutCell ** hit cache - [0:4] 278.5
** FDTemplateLayoutCell ** hit cache - [0:5] 156
** FDTemplateLayoutCell ** hit cache - [0:6] 165