UITableViewHeaderFooterView的使用+自己主动布局
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];
}