使用UITableView的header或footer复用时，假设採用自己主动布局，你会发现有约束冲突，以下这样写能够消除约束冲突：
#import <UIKit/UIKit.h> @interface SectionView : UITableViewHeaderFooterView @property (nonatomic, copy) NSString *sectionTitle; @end
#import "SectionView.h" @interface SectionView () { UIImageView *titleBgImageView; UIImageView *timePonitImageView; UIImageView *circleImageView; UILabel *titleLabe; } @end @implementation SectionView // 带有复用 - (instancetype)initWithReuseIdentifier:(NSString *)reuseIdentifier { self = [super initWithReuseIdentifier:reuseIdentifier]; if (self) { [self createUI]; } return self; } - (void)createUI { titleBgImageView = [[UIImageView alloc] initForAutoLayout]; titleBgImageView.userInteractionEnabled = NO; UIImage *image = [UIImage imageNamed:@"event_bottom_line"]; image = [image stretchableImageWithLeftCapWidth:image.size.width*0.5 topCapHeight:image.size.height*0.5]; titleBgImageView.image = image; [self.contentView addSubview:titleBgImageView]; circleImageView = [[UIImageView alloc] initForAutoLayout]; UIImage *circleImage = [UIImage imageNamed:@"event_blue1"]; circleImage = [circleImage stretchableImageWithLeftCapWidth:circleImage.size.width*0.5 topCapHeight:circleImage.size.height*0.5]; circleImageView.image = circleImage; [self.contentView addSubview:circleImageView]; timePonitImageView = [[UIImageView alloc] initForAutoLayout]; timePonitImageView.image = [UIImage imageNamed:@"event_write_line"]; [self.contentView addSubview:timePonitImageView]; titleLabe = [[UILabel alloc] initForAutoLayout]; titleLabe.font = [UIFont systemFontOfSize:13]; titleLabe.textColor = [UIColor whiteColor]; titleLabe.textAlignment = NSTextAlignmentCenter; [circleImageView addSubview:titleLabe]; } 把布局代码写到这里 - (void)layoutSubviews { [super layoutSubviews]; [titleBgImageView autoPinEdgesToSuperviewEdgesWithInsets:UIEdgeInsetsMake(0, 0, 0, 0)]; [circleImageView autoPinEdgeToSuperviewEdge:ALEdgeLeading withInset:8]; [circleImageView autoPinEdgeToSuperviewEdge:ALEdgeTrailing withInset:8]; [circleImageView autoSetDimension:ALDimensionHeight toSize:23]; [circleImageView autoAlignAxisToSuperviewAxis:ALAxisHorizontal]; [timePonitImageView autoPinEdgeToSuperviewEdge:ALEdgeLeading withInset:16]; [timePonitImageView autoPinEdgeToSuperviewEdge:ALEdgeTop withInset:39/2.0-4]; [timePonitImageView autoSetDimensionsToSize:CGSizeMake(9, 23.5)]; [titleLabe autoCenterInSuperview]; [titleLabe autoSetDimension:ALDimensionWidth toSize:200]; }
转载于:https://www.cnblogs.com/bhlsheji/p/5212507.html
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