调用sizeToFit时，ios应用崩溃，无法识别的选择器发送到实例

Question

我发现了一些与此类似的问题，但找不到答案。 我刚刚开始使用attributedText格式化标签中的文本，这引发了此错误：

-[__NSCFType _isDefaultFace]: unrecognized selector sent to instance 0x20880f40
2014-03-18 19:44:57.039 appName[317:907] *** Terminating app due to uncaught exception     'NSInvalidArgumentException', reason: '-[__NSCFType _isDefaultFace]: unrecognized selector sent to instance 0x20880f40'

这是我的方法

-(void) SetDetails
{
if(_curInfo)
{

    NSUInteger length=[_curInfo.company_name length];
    NSString* des = [NSString stringWithFormat:@"%@\r%@\r\r", _curInfo.company_name, _curInfo.description];
    NSUInteger length2=[des length];

    NSString* descript = [NSString stringWithFormat:@"%@\r%@\r\rTerms\r%@", _curInfo.company_name, _curInfo.description, _curInfo.terms];
    NSMutableAttributedString* attrStr = [NSMutableAttributedString attributedStringWithString:descript];

    [attrStr setFontName:@"System - System Bold" size:17 range:NSMakeRange(0, length)];
    [attrStr setTextBold:YES range:NSMakeRange(0, length)];

    [attrStr setFontName:@"System - System Bold" size:17 range:NSMakeRange(length2, 5)];
    [attrStr setTextBold:YES range:NSMakeRange(length2, 5)];



    _lblDescription.attributedText=attrStr;





    [_lblDescription sizeToFit];




    _lblReward.text=_curInfo.reward;

    CGFloat scrollViewHeight = 0.0f;
    for (UIView* view in scroller.subviews)
    {
        scrollViewHeight += view.frame.size.height;

    }

    [scroller setContentSize:(CGSizeMake(320, scrollViewHeight))];

}
}

执行此行[_lblDescription sizeToFit];时将[_lblDescription sizeToFit];

我绝不是专家，任何建议或建议都非常感谢。

头文件（如果需要）：

#import <UIKit/UIKit.h>
#import "ServiceConnector.h"
#import "Global.h"

@interface RestaurantDetail : UIViewController<ServiceConnectorDelegate, UIAlertViewDelegate>{
    IBOutlet UIScrollView *scroller;

}

@property (nonatomic, retain) IBOutlet UIImageView* imgCompany;
@property (nonatomic, retain) IBOutlet UILabel* lblTopName;
@property (nonatomic, retain) IBOutlet UILabel* lblReward;
@property (nonatomic, retain) IBOutlet UILabel* lblCity;
@property (nonatomic, retain) IBOutlet UILabel* lblStreet;
@property (nonatomic, retain) IBOutlet UIButton* btnStreet;

@property (nonatomic, retain) IBOutlet UILabel* lblDistance;
@property (nonatomic, retain) IBOutlet UIButton* btnReward;
@property (nonatomic, retain) IBOutlet UILabel* lblDescription;

@property (nonatomic, retain) RestaurantInfo*   curInfo;
@property (nonatomic, retain) BonusInfo*        bonusInfo;
@property (nonatomic, retain) NSString*        website;


-(IBAction)BackClicked;
-(IBAction)GetRewardClicked;
-(IBAction)TermsClicked;
-(void) GetDetails;
-(void) SetDetails;
- (IBAction)StreetClicked;

// service connector delegate
- (void)requestReturnedData:(NSData*)data;

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;

@end

Answer 1

谢谢所有发表评论的人。 它使我指出了正确的方向，以弄清这一点。 它确实确实是一个内存问题，尽管我不太了解它，但它不喜欢我如何更改属性字符串。

我改变了这个

[attrStr setFontName:@"System - System Bold" size:17 range:NSMakeRange(0, length)];
[attrStr setTextBold:YES range:NSMakeRange(0, length)];

对此

[attrStr addAttribute:NSFontAttributeName value:[UIFont boldSystemFontOfSize:17] range:NSMakeRange(0, length)];