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Optimized height calculation #382

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Optimized height calculation #382

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39 changes: 2 additions & 37 deletions Classes/UITableView+FDTemplateLayoutCell.m
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Original file line number Diff line number Diff line change
Expand Up @@ -73,41 +73,9 @@ - (CGFloat)fd_systemFittingHeightForConfiguratedCell:(UITableViewCell *)cell {
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];

// [bug fix] after iOS 10.3, Auto Layout engine will add an additional 0 width constraint onto cell's content view, to avoid that, we add constraints to content view's left, right, top and bottom.
static BOOL isSystemVersionEqualOrGreaterThen10_2 = NO;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
isSystemVersionEqualOrGreaterThen10_2 = [UIDevice.currentDevice.systemVersion compare:@"10.2" options:NSNumericSearch] != NSOrderedAscending;
});

NSArray<NSLayoutConstraint *> *edgeConstraints;
if (isSystemVersionEqualOrGreaterThen10_2) {
// To avoid confilicts, make width constraint softer than required (1000)
widthFenceConstraint.priority = UILayoutPriorityRequired - 1;

// Build edge constraints
NSLayoutConstraint *leftConstraint = [NSLayoutConstraint constraintWithItem:cell.contentView attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:cell attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0];
NSLayoutConstraint *rightConstraint = [NSLayoutConstraint constraintWithItem:cell.contentView attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:cell attribute:NSLayoutAttributeRight multiplier:1.0 constant:-rightSystemViewsWidth];
NSLayoutConstraint *topConstraint = [NSLayoutConstraint constraintWithItem:cell.contentView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:cell attribute:NSLayoutAttributeTop multiplier:1.0 constant:0];
NSLayoutConstraint *bottomConstraint = [NSLayoutConstraint constraintWithItem:cell.contentView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:cell attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0];
edgeConstraints = @[leftConstraint, rightConstraint, topConstraint, bottomConstraint];
[cell addConstraints:edgeConstraints];
}

[cell.contentView addConstraint:widthFenceConstraint];

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

// Clean-ups
[cell.contentView removeConstraint:widthFenceConstraint];
if (isSystemVersionEqualOrGreaterThen10_2) {
[cell removeConstraints:edgeConstraints];
}
fittingHeight = [cell.contentView systemLayoutSizeFittingSize:CGSizeMake(contentViewWidth, UILayoutFittingCompressedSize.height)].height;

[self fd_debugLog:[NSString stringWithFormat:@"calculate using system fitting size (AutoLayout) - %@", @(fittingHeight)]];
}
Expand Down Expand Up @@ -250,10 +218,7 @@ - (__kindof UITableViewHeaderFooterView *)fd_templateHeaderFooterViewForReuseIde
- (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];
CGFloat fittingHeight = [templateHeaderFooterView systemLayoutSizeFittingSize:CGSizeMake(CGRectGetWidth(self.frame), UILayoutFittingCompressedSize.height)].height;

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