问题描述
@interface PromotionsListViewController : UITableViewController
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"PromotionCell";
PromotionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[PromotionCell alloc] init];
}
// Configure the cell...
Promotion *promotion = [self.promotionList objectAtIndex:indexPath.row];
[cell.imgView setImageWithURL:[NSURL URLWithString:promotion.imageURL] placeholderImage:[UIImage imageNamed:@""]];
cell.lblTitle.text = promotion.promotionTitle;
return cell;
}
@interface PromotionCell : UITableViewCell
@property(nonatomic, strong) UIImageView *imgView;
@property(nonatomic, strong) UILabel *lblTitle;
@end
- (void)layoutSubviews {
if (self.lblTitle.text) {
CGSize maxsize = CGSizeMake(300, CGFLOAT_MAX);
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
CGRect calculateRect = [_lblTitle.text boundingRectWithSize:maxsize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:_lblTitle.font, NSParagraphStyleAttributeName:paragraphStyle.copy} context:nil];
_lblTitle.frame = CGRectMake(_lblTitle.frame.origin.x, 300 - calculateRect.size.height - 5, _lblTitle.frame.size.width, calculateRect.size.height);
} else {
_lblTitle.frame = CGRectZero;
}
}
- (UILabel *)lblTitle {
if (!_lblTitle) {
_lblTitle = [[UILabel alloc] initWithFrame:CGRectMake(10, 250, 300, 50)];
_lblTitle.font = [UIFont boldSystemFontOfSize:22.0f];
_lblTitle.numberOfLines = 0;
_lblTitle.lineBreakMode = NSLineBreakByWordWrapping;
[self.contentView addSubview:_lblTitle];
}
return _lblTitle;
}
任何人都可以告诉我，我做错了什么？我希望我的问题很清楚..
Can anybody plz tell me what am I doing wrong? I hope my Question is clear..
推荐答案
我也有这个问题。事实证明， boundingRectWithSize有两种类似的方法：。一个用于 NSString ，一个用于 NSAttributedString 。
I had this problem too. Turns out there are two similar methods for boundingRectWithSize:. One for NSString and one for NSAttributedString.
以下针对NSAttributedString适用于iOS 6及更高版本：
The following for NSAttributedString is available for iOS 6 and above:
- （CGRect）boundingRectWithSize：（CGSize）大小选项：（NSStringDrawingOptions）选项上下文： （NSStringDrawingContext *）context
另一个NSString方法（您当前使用的）仅适用于iOS 7：
The other NSString method (which you're currently using) is only available on iOS 7:
- （CGRect）boundingRectWithSize：（CGSize）size options：（NSStringDrawingOptions）options attributes：（NSDictionary *）attributes context：（NSStringDrawingContext *）context
所以只需调用 boundingRectWithSize：方法，无需额外的属性：你的Attributed String字段，它在iOS 6上运行正常。
So just call the boundingRectWithSize: method without an extra Attributes: field on your Attributed String and it'll work fine on iOS 6.
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