一、主要实现：
1.支持自定义cell多选图标
2.支持定义cell多选图标位置
3.支持指定不可选indexPath
image.png
二、使用方法：
1.支持自定义cell多选图标
@implementation CustomTableViewCell
- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style
reuseIdentifier:reuseIdentifier];
if (self) {
[self zh_replaceSystemMutiSelectImage:[UIImage imageNamed:@"icon_select"] normalImage:[UIImage imageNamed:@"icon_noSelect"]];
}
return self;
}
在自定义cell中调用zh_replaceSystemMutiSelectImage:normalImage:方法,传入自定义选中图片与未选中图片.
2.支持定义cell多选图标位置
/**
如果你有某些cell是想自定义多选图标位置的
1.设置zh_selectImageViewFrame，此属性使用后其他indexPath要设置为CGRectZero，分类内部无法判断重用
*/
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == 5) {
cell.zh_selectImageViewFrame = CGRectMake(13, 10, 23, 23);
}else {
cell.zh_selectImageViewFrame = CGRectZero;
}
}
在cellforrow中设置多选图标的frame，设置zh_selectImageViewFrame，此属性使用后其他indexPath要设置为CGRectZero，分类内部无法判断重用
3.支持指定不可选indexPath
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CustomTableViewCell"];
if (!cell) {
cell = [[CustomTableViewCell alloc] initWithStyle:(UITableViewCellStyleDefault) reuseIdentifier:@"CustomTableViewCell"];
}
/**
如果你有某些cell是不想支持多选的
1.实现- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath 对制定的indexPath返回nil；
2.设置zh_isCanSelect为NO，此属性使用后其他不隐藏indexPath要设置为YES，分类内部无法判断重用
*/
if (indexPath.row == 3) {
cell.zh_isCanSelect = NO;
}else {
cell.zh_isCanSelect = YES;
}
cell.textLabel.text = [NSString stringWithFormat:@"Index:%ld",indexPath.row];
return cell;
}
设置zh_isCanSelect为NO，此属性使用后其他不隐藏indexPath要设置为YES，分类内部无法判断重用
三、具体实现UITableViewCell+Editing.h
@interface UITableViewCell (Editing)
//当前cell多选状态
@property (nonatomic, assign,readonly) BOOL zh_isEditingSelect;
//图标frame
@property (nonatomic, assign) CGRect zh_selectImageViewFrame;
//是否可以选中
@property (nonatomic, assign) BOOL zh_isCanSelect;
//替换系统多选图标
- (void)zh_replaceSystemMutiSelectImage:(UIImage *)selectImage normalImage:(UIImage *)normalImage;
@end
#import "UITableViewCell+Editing.h"
#import <objc/runtime.h>
static const void *kZh_Edit_SelectImage = @"kZh_Edit_SelectImage";
static const void *kZh_Edit_NomalImage = @"kZh_Edit_NomalImage";
static const void *kZh_SelectImageView = @"kZh_SelectImageView";
@interface UITableViewCell ()
@property (nonatomic, strong)UIImage *zh_Edit_SelectImage;
@property (nonatomic, strong)UIImage *zh_Edit_NomalImage;
@property (nonatomic, strong)UIImageView *zh_SelectImageView;
//当前cell多选状态
@property (nonatomic, assign) BOOL zh_isEditingSelect;
@end
@implementation UITableViewCell (Editing)
#pragma mark - Swizzling
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
Class class = [self class];
SEL originalSelector = @selector(layoutSubviews);
SEL swizzledSelector = @selector(swizzling_layoutSubviews);
Method originalMethod = class_getInstanceMethod(class, originalSelector);
Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
method_exchangeImplementations(originalMethod, swizzledMethod);
});
}
- (void)swizzling_layoutSubviews {
[self swizzling_layoutSubviews];
//当前cell不支持多选
if (!self.zh_isCanSelect) {
[self zh_removeSystemSelect];
[self zh_removeSelectView];
return;
}
//隐藏系统多选图标
if (self.ksHiddenSystemMutSelect) {
[self zh_removeSystemSelect];
}else {
return;
}
//添加/移除自定义多选图标
if (self.isEditing) {
[self zh_addSelectView];
//判断当前cell选中状态
UITableView *tableView = (UITableView *)self.superview;
CGRect cellRect = [tableView convertRect:self.frame toView:tableView];
if ([[tableView indexPathsForSelectedRows] containsObject:[tableView indexPathForRowAtPoint:CGPointMake(cellRect.origin.x + cellRect.size.width/2.f, cellRect.origin.y+cellRect.size.height/2.f)]]) {
self.zh_isEditingSelect = YES;
}else {
self.zh_isEditingSelect = NO;
}
//自定义多选图标自定义frame
if (self.zh_SelectImageView) {
if (!CGRectEqualToRect(self.zh_selectImageViewFrame, CGRectZero)) {
self.zh_SelectImageView.frame = self.zh_selectImageViewFrame;
} else {
self.zh_SelectImageView.frame = CGRectMake(13, (self.frame.size.height-23)/2.f, 23, 23);
}
}
}else {
[self zh_removeSelectView];
}
}
//替换体统多选图标为自定义图标
- (void)zh_replaceSystemMutiSelectImage:(UIImage *)selectImage normalImage:(UIImage *)normalImage {
self.ksHiddenSystemMutSelect = YES;
self.zh_Edit_SelectImage = selectImage;
self.zh_Edit_NomalImage = normalImage;
}
//移除系统图标
- (void)zh_removeSystemSelect {
for (UIView* subview in [self subviews]) {
// As determined by NSLogging every subview's class, and guessing which was the one I wanted
if ([NSStringFromClass([subview class]) isEqualToString:@"UITableViewCellEditControl"]) {
subview.hidden = YES;
break;
}
}
}
//添加自定义多选imageView
- (void)zh_addSelectView {
if (self.zh_SelectImageView) {
return;
}
UIImageView *selectImageView = [[UIImageView alloc] initWithImage:self.zh_Edit_NomalImage];
self.zh_SelectImageView = selectImageView;
[self addSubview:selectImageView];
}
//移除自定义多选imageView
- (void)zh_removeSelectView {
if (self.zh_SelectImageView) {
[self.zh_SelectImageView removeFromSuperview];
self.zh_SelectImageView = nil;
}
}
- (void)setZh_Edit_NomalImage:(UIImage *)zh_Edit_NomalImage {
objc_setAssociatedObject(self, kZh_Edit_NomalImage, zh_Edit_NomalImage, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (UIImage *)zh_Edit_NomalImage {
return objc_getAssociatedObject(self, kZh_Edit_NomalImage);
}
- (void)setZh_Edit_SelectImage:(UIImage *)zh_Edit_SelectImage {
objc_setAssociatedObject(self, kZh_Edit_SelectImage, zh_Edit_SelectImage, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (UIImage *)zh_Edit_SelectImage {
return objc_getAssociatedObject(self, kZh_Edit_SelectImage);
}
- (void)setZh_isEditingSelect:(BOOL)zh_isEditingSelect {
if (self.zh_SelectImageView) {
if (zh_isEditingSelect) {
self.zh_SelectImageView.image = self.zh_Edit_SelectImage;
} else {
self.zh_SelectImageView.image = self.zh_Edit_NomalImage;
}
}
objc_setAssociatedObject(self, @selector(zh_isEditingSelect), [NSNumber numberWithBool:zh_isEditingSelect], OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (BOOL)zh_isEditingSelect {
return [objc_getAssociatedObject(self, @selector(zh_isEditingSelect)) boolValue];
}
- (BOOL)zh_isCanSelect {
return [objc_getAssociatedObject(self, @selector(zh_isCanSelect)) boolValue];
}
- (void)setZh_isCanSelect:(BOOL)zh_isCanSelect {
objc_setAssociatedObject(self, @selector(zh_isCanSelect), [NSNumber numberWithBool:zh_isCanSelect], OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (BOOL)ksHiddenSystemMutSelect {
return [objc_getAssociatedObject(self, @selector(ksHiddenSystemMutSelect)) boolValue];
}
-(void)setKsHiddenSystemMutSelect:(BOOL)ksHiddenSystemMutSelect {
objc_setAssociatedObject(self, @selector(ksHiddenSystemMutSelect), [NSNumber numberWithBool:ksHiddenSystemMutSelect], OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (UIImageView *)zh_SelectImageView {
return objc_getAssociatedObject(self, kZh_SelectImageView);
}
- (void)setZh_SelectImageView:(UIImageView *)zh_SelectImageView {
objc_setAssociatedObject(self, kZh_SelectImageView, zh_SelectImageView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (CGRect)zh_selectImageViewFrame {
return [objc_getAssociatedObject(self, @selector(zh_selectImageViewFrame)) CGRectValue];
}
- (void)setZh_selectImageViewFrame:(CGRect)zh_selectImageViewFrame {
if (self.zh_SelectImageView) {
self.zh_SelectImageView.frame = zh_selectImageViewFrame;
}
objc_setAssociatedObject(self, @selector(zh_selectImageViewFrame),[NSValue valueWithCGRect:zh_selectImageViewFrame] , OBJC_ASSOCIATION_COPY_NONATOMIC);
}
四、场景
1.自定义cell的多选图标，系统的太丑，无侵入，使用简单
2.在聊天页面合并转发消息需要指定某些消息不可以选中转发
3.自定义frame主要是系统的多选默认是居中的，但是在聊天页面多选图标可能要求与聊天头像居中对齐
image.png
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