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fd_heightForHeaderFooterViewWithIdentifier:configuration 少了数据源 #244

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fd_heightForHeaderFooterViewWithIdentifier:configuration 少了数据源 #244

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fd_heightForHeaderFooterViewWithIdentifier:configuration 少了数据源
Sep 25, 2016
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Sep 25, 2016
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113 changes: 60 additions & 53 deletions Classes/UITableView+FDTemplateLayoutCell.m
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Original file line number Diff line number Diff line change
Expand Up @@ -27,45 +27,44 @@ @implementation UITableView (FDTemplateLayoutCell)

- (CGFloat)fd_systemFittingHeightForConfiguratedCell:(UITableViewCell *)cell {
CGFloat contentViewWidth = CGRectGetWidth(self.frame);

// If a cell has accessory view or system accessory type, its content view's width is smaller
// than cell's by some fixed values.
if (cell.accessoryView) {
contentViewWidth -= 16 + CGRectGetWidth(cell.accessoryView.frame);
} else {
static const CGFloat systemAccessoryWidths[] = {
[UITableViewCellAccessoryNone] = 0,
[UITableViewCellAccessoryDisclosureIndicator] = 34,
[UITableViewCellAccessoryDetailDisclosureButton] = 68,
[UITableViewCellAccessoryCheckmark] = 40,
[UITableViewCellAccessoryDetailButton] = 48
};
[UITableViewCellAccessoryNone] = 0,
[UITableViewCellAccessoryDisclosureIndicator] = 34,
[UITableViewCellAccessoryDetailDisclosureButton] = 68,
[UITableViewCellAccessoryCheckmark] = 40,
[UITableViewCellAccessoryDetailButton] = 48};
contentViewWidth -= systemAccessoryWidths[cell.accessoryType];
}

// If not using auto layout, you have to override "-sizeThatFits:" to provide a fitting size by yourself.
// This is the same height calculation passes used in iOS8 self-sizing cell's implementation.
//
// 1. Try "- systemLayoutSizeFittingSize:" first. (skip this step if 'fd_enforceFrameLayout' set to YES.)
// 2. Warning once if step 1 still returns 0 when using AutoLayout
// 3. Try "- sizeThatFits:" if step 1 returns 0
// 4. Use a valid height or default row height (44) if not exist one

CGFloat fittingHeight = 0;

if (!cell.fd_enforceFrameLayout && contentViewWidth > 0) {
// Add a hard width constraint to make dynamic content views (like labels) expand vertically instead
// of growing horizontally, in a flow-layout manner.
NSLayoutConstraint *widthFenceConstraint = [NSLayoutConstraint constraintWithItem:cell.contentView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:contentViewWidth];
NSLayoutConstraint * widthFenceConstraint = [NSLayoutConstraint constraintWithItem:cell.contentView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:contentViewWidth];
[cell.contentView addConstraint:widthFenceConstraint];

// Auto layout engine does its math
fittingHeight = [cell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
[cell.contentView removeConstraint:widthFenceConstraint];

[self fd_debugLog:[NSString stringWithFormat:@"calculate using system fitting size (AutoLayout) - %@", @(fittingHeight)]];
}

if (fittingHeight == 0) {
#if DEBUG
// Warn if using AutoLayout but get zero height.
Expand All @@ -79,35 +78,35 @@ - (CGFloat)fd_systemFittingHeightForConfiguratedCell:(UITableViewCell *)cell {
// Try '- sizeThatFits:' for frame layout.
// Note: fitting height should not include separator view.
fittingHeight = [cell sizeThatFits:CGSizeMake(contentViewWidth, 0)].height;

[self fd_debugLog:[NSString stringWithFormat:@"calculate using sizeThatFits - %@", @(fittingHeight)]];
}

// Still zero height after all above.
if (fittingHeight == 0) {
// Use default row height.
fittingHeight = 44;
}

// Add 1px extra space for separator line if needed, simulating default UITableViewCell.
if (self.separatorStyle != UITableViewCellSeparatorStyleNone) {
fittingHeight += 1.0 / [UIScreen mainScreen].scale;
}

return fittingHeight;
}

- (__kindof UITableViewCell *)fd_templateCellForReuseIdentifier:(NSString *)identifier {
NSAssert(identifier.length > 0, @"Expect a valid identifier - %@", identifier);
NSMutableDictionary<NSString *, UITableViewCell *> *templateCellsByIdentifiers = objc_getAssociatedObject(self, _cmd);

NSMutableDictionary<NSString *, UITableViewCell *> * templateCellsByIdentifiers = objc_getAssociatedObject(self, _cmd);
if (!templateCellsByIdentifiers) {
templateCellsByIdentifiers = @{}.mutableCopy;
objc_setAssociatedObject(self, _cmd, templateCellsByIdentifiers, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
UITableViewCell *templateCell = templateCellsByIdentifiers[identifier];

UITableViewCell * templateCell = templateCellsByIdentifiers[identifier];

if (!templateCell) {
templateCell = [self dequeueReusableCellWithIdentifier:identifier];
NSAssert(templateCell != nil, @"Cell must be registered to table view for identifier - %@", identifier);
Expand All @@ -116,62 +115,62 @@ - (__kindof UITableViewCell *)fd_templateCellForReuseIdentifier:(NSString *)iden
templateCellsByIdentifiers[identifier] = templateCell;
[self fd_debugLog:[NSString stringWithFormat:@"layout cell created - %@", identifier]];
}

return templateCell;
}

- (CGFloat)fd_heightForCellWithIdentifier:(NSString *)identifier configuration:(void (^)(id cell))configuration {
if (!identifier) {
return 0;
}
UITableViewCell *templateLayoutCell = [self fd_templateCellForReuseIdentifier:identifier];

UITableViewCell * templateLayoutCell = [self fd_templateCellForReuseIdentifier:identifier];

// Manually calls to ensure consistent behavior with actual cells. (that are displayed on screen)
[templateLayoutCell prepareForReuse];

// Customize and provide content for our template cell.
if (configuration) {
configuration(templateLayoutCell);
}

return [self fd_systemFittingHeightForConfiguratedCell:templateLayoutCell];
}

- (CGFloat)fd_heightForCellWithIdentifier:(NSString *)identifier cacheByIndexPath:(NSIndexPath *)indexPath configuration:(void (^)(id cell))configuration {
if (!identifier || !indexPath) {
return 0;
}

// Hit cache
if ([self.fd_indexPathHeightCache existsHeightAtIndexPath:indexPath]) {
[self fd_debugLog:[NSString stringWithFormat:@"hit cache by index path[%@:%@] - %@", @(indexPath.section), @(indexPath.row), @([self.fd_indexPathHeightCache heightForIndexPath:indexPath])]];
return [self.fd_indexPathHeightCache heightForIndexPath:indexPath];
}

CGFloat height = [self fd_heightForCellWithIdentifier:identifier configuration:configuration];
[self.fd_indexPathHeightCache cacheHeight:height byIndexPath:indexPath];
[self fd_debugLog:[NSString stringWithFormat: @"cached by index path[%@:%@] - %@", @(indexPath.section), @(indexPath.row), @(height)]];
[self fd_debugLog:[NSString stringWithFormat:@"cached by index path[%@:%@] - %@", @(indexPath.section), @(indexPath.row), @(height)]];

return height;
}

- (CGFloat)fd_heightForCellWithIdentifier:(NSString *)identifier cacheByKey:(id<NSCopying>)key configuration:(void (^)(id cell))configuration {
if (!identifier || !key) {
return 0;
}

// Hit cache
if ([self.fd_keyedHeightCache existsHeightForKey:key]) {
CGFloat cachedHeight = [self.fd_keyedHeightCache heightForKey:key];
[self fd_debugLog:[NSString stringWithFormat:@"hit cache by key[%@] - %@", key, @(cachedHeight)]];
return cachedHeight;
}

CGFloat height = [self fd_heightForCellWithIdentifier:identifier configuration:configuration];
[self.fd_keyedHeightCache cacheHeight:height byKey:key];
[self fd_debugLog:[NSString stringWithFormat:@"cached by key[%@] - %@", key, @(height)]];

return height;
}

Expand All @@ -181,39 +180,47 @@ @implementation UITableView (FDTemplateLayoutHeaderFooterView)

- (__kindof UITableViewHeaderFooterView *)fd_templateHeaderFooterViewForReuseIdentifier:(NSString *)identifier {
NSAssert(identifier.length > 0, @"Expect a valid identifier - %@", identifier);
NSMutableDictionary<NSString *, UITableViewHeaderFooterView *> *templateHeaderFooterViews = objc_getAssociatedObject(self, _cmd);

NSMutableDictionary<NSString *, UITableViewHeaderFooterView *> * templateHeaderFooterViews = objc_getAssociatedObject(self, _cmd);
if (!templateHeaderFooterViews) {
templateHeaderFooterViews = @{}.mutableCopy;
objc_setAssociatedObject(self, _cmd, templateHeaderFooterViews, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
UITableViewHeaderFooterView *templateHeaderFooterView = templateHeaderFooterViews[identifier];

UITableViewHeaderFooterView * templateHeaderFooterView = templateHeaderFooterViews[identifier];

if (!templateHeaderFooterView) {
templateHeaderFooterView = [self dequeueReusableHeaderFooterViewWithIdentifier:identifier];
NSAssert(templateHeaderFooterView != nil, @"HeaderFooterView must be registered to table view for identifier - %@", identifier);
templateHeaderFooterView.contentView.translatesAutoresizingMaskIntoConstraints = NO;
templateHeaderFooterViews[identifier] = templateHeaderFooterView;
[self fd_debugLog:[NSString stringWithFormat:@"layout header footer view created - %@", identifier]];
}

return templateHeaderFooterView;
}

- (CGFloat)fd_heightForHeaderFooterViewWithIdentifier:(NSString *)identifier configuration:(void (^)(id))configuration {
UITableViewHeaderFooterView *templateHeaderFooterView = [self fd_templateHeaderFooterViewForReuseIdentifier:identifier];

NSLayoutConstraint *widthFenceConstraint = [NSLayoutConstraint constraintWithItem:templateHeaderFooterView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:CGRectGetWidth(self.frame)];
[templateHeaderFooterView addConstraint:widthFenceConstraint];
CGFloat fittingHeight = [templateHeaderFooterView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
[templateHeaderFooterView removeConstraint:widthFenceConstraint];

if (fittingHeight == 0) {
fittingHeight = [templateHeaderFooterView sizeThatFits:CGSizeMake(CGRectGetWidth(self.frame), 0)].height;

UITableViewHeaderFooterView * templateHeaderFooterView = [self fd_templateHeaderFooterViewForReuseIdentifier:identifier];
[templateHeaderFooterView prepareForReuse];

/** 数据源 */
!configuration ?: configuration(templateHeaderFooterView);

CGFloat contentViewWidth = CGRectGetWidth(self.frame);

CGSize fittingSize = CGSizeZero;

if (contentViewWidth > 0) {
NSLayoutConstraint * widthFenceConstraint = [NSLayoutConstraint constraintWithItem:templateHeaderFooterView.contentView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:contentViewWidth];
[templateHeaderFooterView.contentView addConstraint:widthFenceConstraint];
// Auto layout engine does its math
fittingSize = [templateHeaderFooterView.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
[templateHeaderFooterView.contentView removeConstraint:widthFenceConstraint];
}
return fittingHeight;

return fittingSize.height;
}

@end
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