IOS类似QQ点赞列表点击
2017-08-02 本文已影响70人
大炮打小鸟
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1、先创建一个UILabel的分类（UILabel+QQThumbList）
.h
#import <UIKit/UIKit.h>
@protocol QQThumbListTapActionDelegate <NSObject>
@optional
/**
* QQThumbListTapActionDelegate
*
* @param string 点击的字符串
* @param range 点击的字符串range
* @param index 点击的字符在数组中的index
*/
- (void)AttributeTapReturnString:(NSString *)string
range:(NSRange)range
index:(NSInteger)index;
@end
@interface AttributeModel : NSObject
@property(nonatomic,copy)NSString *str;
@property(nonatomic,assign)NSRange range;
@end
@interface UILabel (QQThumbList)
@property (nonatomic, assign) BOOL enabledTapEffect;//是否打开点击效果，默认是打开
/**
* 给文本添加点击事件Block回调
*
* @param strings 需要添加的字符串数组
* @param tapClick 点击事件回调
*/
- (void)AddAttributeTapActionWithStrings:(NSArray <NSString *> *)strings tapClicked:(void (^) (NSString *string , NSRange range , NSInteger index))tapClick;
/**
* 给文本添加点击事件delegate回调
*
* @param strings 需要添加的字符串数组
* @param delegate delegate
*/
- (void)AddAttributeTapActionWithStrings:(NSArray <NSString *> *)strings delegate:(id <QQThumbListTapActionDelegate> )delegate;
@end
.m
#define TextFont 14 //要与创建label的font一致
#import "UILabel+QQThumbList.h"
#import <objc/runtime.h>
#import <CoreText/CoreText.h>
#import <Foundation/Foundation.h>
@implementation AttributeModel
@end
@implementation UILabel (QQThumbList)
#pragma mark - AssociatedObjects
- (NSMutableArray *)attributeStrings
{
return objc_getAssociatedObject(self, _cmd);
}
- (void)setAttributeStrings:(NSMutableArray *)attributeStrings
{
objc_setAssociatedObject(self, @selector(attributeStrings), attributeStrings, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (NSMutableDictionary *)effectDic
{
return objc_getAssociatedObject(self, _cmd);
}
- (void)setEffectDic:(NSMutableDictionary *)effectDic
{
objc_setAssociatedObject(self, @selector(effectDic), effectDic, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (BOOL)isTapAction
{
return [objc_getAssociatedObject(self, _cmd) boolValue];
}
- (void)setIsTapAction:(BOOL)isTapAction
{
objc_setAssociatedObject(self, @selector(isTapAction), @(isTapAction), OBJC_ASSOCIATION_ASSIGN);
}
- (void (^)(NSString *, NSRange, NSInteger))tapBlock
{
return objc_getAssociatedObject(self, _cmd);
}
- (void)setTapBlock:(void (^)(NSString *, NSRange, NSInteger))tapBlock
{
objc_setAssociatedObject(self, @selector(tapBlock), tapBlock, OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (id<QQThumbListTapActionDelegate>)delegate
{
return objc_getAssociatedObject(self, _cmd);
}
- (BOOL)enabledTapEffect
{
return [objc_getAssociatedObject(self, _cmd) boolValue];
}
- (void)setEnabledTapEffect:(BOOL)enabledTapEffect
{
objc_setAssociatedObject(self, @selector(enabledTapEffect), @(enabledTapEffect), OBJC_ASSOCIATION_ASSIGN);
self.isTapEffect = enabledTapEffect;
}
- (BOOL)isTapEffect
{
return [objc_getAssociatedObject(self, _cmd) boolValue];
}
- (void)setIsTapEffect:(BOOL)isTapEffect
{
objc_setAssociatedObject(self, @selector(isTapEffect), @(isTapEffect), OBJC_ASSOCIATION_ASSIGN);
}
- (void)setDelegate:(id<QQThumbListTapActionDelegate>)delegate
{
objc_setAssociatedObject(self, @selector(delegate), delegate, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
#pragma mark - mainFunction
- (void)AddAttributeTapActionWithStrings:(NSArray <NSString *> *)strings tapClicked:(void (^) (NSString *string , NSRange range , NSInteger index))tapClick
{
[self GetRangesWithStrings:strings];
if (self.tapBlock != tapClick) {
self.tapBlock = tapClick;
}
}
- (void)AddAttributeTapActionWithStrings:(NSArray <NSString *> *)strings delegate:(id <QQThumbListTapActionDelegate> )delegate
{
[self GetRangesWithStrings:strings];
if (self.delegate != delegate) {
self.delegate = delegate;
}
}
#pragma mark - touchAction
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (!self.isTapAction) {
return;
}
if (objc_getAssociatedObject(self, @selector(enabledTapEffect))) {
self.isTapEffect = self.enabledTapEffect;
}
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self];
__weak typeof(self) weakSelf = self;
[self GetTapFrameWithTouchPoint:point result:^(NSString *string, NSRange range, NSInteger index) {
if (weakSelf.tapBlock) {
weakSelf.tapBlock (string , range , index);
}
if (weakSelf.delegate && [weakSelf.delegate respondsToSelector:@selector(AttributeTapReturnString:range:index:)]) {
[weakSelf.delegate AttributeTapReturnString:string range:range index:index];
}
if (self.isTapEffect) {
[self SaveEffectDicWithRange:range];
[self TapEffectWithStatus:YES];
}
}];
}
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
if (self.isTapAction) {
if ([self GetTapFrameWithTouchPoint:point result:nil]) {
return self;
}
}
return [super hitTest:point withEvent:event];
}
#pragma mark - getTapFrame
- (BOOL)GetTapFrameWithTouchPoint:(CGPoint)point result:(void (^) (NSString *string , NSRange range , NSInteger index))resultBlock
{
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)self.attributedText);
CGMutablePathRef Path = CGPathCreateMutable();
CGPathAddRect(Path, NULL, CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height));
CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), Path, NULL);
CFRange range = CTFrameGetVisibleStringRange(frame);
if (self.attributedText.length > range.length) {
UIFont *font ;
if ([self.attributedText attribute:NSFontAttributeName atIndex:0 effectiveRange:nil]) {
font = [self.attributedText attribute:NSFontAttributeName atIndex:0 effectiveRange:nil];
}else if (self.font){
font = self.font;
}else {
font = [UIFont systemFontOfSize: TextFont];
}
CGPathRelease(Path);
Path = CGPathCreateMutable();
CGPathAddRect(Path, NULL, CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height + font.lineHeight));
frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), Path, NULL);
}
CFArrayRef lines = CTFrameGetLines(frame);
if (!lines) {
CFRelease(frame);
CFRelease(framesetter);
CGPathRelease(Path);
return NO;
}
CFIndex count = CFArrayGetCount(lines);
CGPoint origins[count];
CTFrameGetLineOrigins(frame, CFRangeMake(0, 0), origins);
CGAffineTransform transform = [self TransformForCoreText];
CGFloat verticalOffset = 0;
for (CFIndex i = 0; i < count; i++) {
CGPoint linePoint = origins[i];
CTLineRef line = CFArrayGetValueAtIndex(lines, i);
CGRect flippedRect = [self GetLineBounds:line point:linePoint];
CGRect rect = CGRectApplyAffineTransform(flippedRect, transform);
rect = CGRectInset(rect, 0, 0);
rect = CGRectOffset(rect, 0, verticalOffset);
NSParagraphStyle *style = [self.attributedText attribute:NSParagraphStyleAttributeName atIndex:0 effectiveRange:nil];
CGFloat lineSpace;
if (style) {
lineSpace = style.lineSpacing;
}else {
lineSpace = 0;
}
CGFloat lineOutSpace = (self.bounds.size.height - lineSpace * (count - 1) -rect.size.height * count) / 2;
rect.origin.y = lineOutSpace + rect.size.height * i + lineSpace * i;
if (CGRectContainsPoint(rect, point)) {
CGPoint relativePoint = CGPointMake(point.x - CGRectGetMinX(rect), point.y - CGRectGetMinY(rect));
CFIndex index = CTLineGetStringIndexForPosition(line, relativePoint);
CGFloat offset;
CTLineGetOffsetForStringIndex(line, index, &offset);
if (offset > relativePoint.x) {
index = index - 1;
}
NSInteger link_count = self.attributeStrings.count;
for (int j = 0; j < link_count; j++) {
AttributeModel *model = self.attributeStrings[j];
NSRange link_range = model.range;
if (NSLocationInRange(index, link_range)) {
if (resultBlock) {
resultBlock (model.str , model.range , (NSInteger)j);
}
CFRelease(frame);
CFRelease(framesetter);
CGPathRelease(Path);
return YES;
}
}
}
}
CFRelease(frame);
CFRelease(framesetter);
CGPathRelease(Path);
return NO;
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (self.isTapEffect) {
[self performSelectorOnMainThread:@selector(TapEffectWithStatus:) withObject:nil waitUntilDone:NO];
}
}
- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (self.isTapEffect) {
[self performSelectorOnMainThread:@selector(TapEffectWithStatus:) withObject:nil waitUntilDone:NO];
}
}
- (CGAffineTransform)TransformForCoreText
{
return CGAffineTransformScale(CGAffineTransformMakeTranslation(0, self.bounds.size.height), 1.f, -1.f);
}
- (CGRect)GetLineBounds:(CTLineRef)line point:(CGPoint)point
{
CGFloat ascent = 0.0f;
CGFloat descent = 0.0f;
CGFloat leading = 0.0f;
CGFloat width = (CGFloat)CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
CGFloat height = ascent + fabs(descent) + leading;
return CGRectMake(point.x, point.y , width, height);
}
#pragma mark - tapEffect
- (void)TapEffectWithStatus:(BOOL)status
{
if (self.isTapEffect) {
NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
NSMutableAttributedString *subAtt = [[NSMutableAttributedString alloc] initWithAttributedString:[[self.effectDic allValues] firstObject]];
NSRange range = NSRangeFromString([[self.effectDic allKeys] firstObject]);
if (status) {
[subAtt addAttribute:NSBackgroundColorAttributeName value:[UIColor lightGrayColor] range:NSMakeRange(0, subAtt.string.length)];
[attStr replaceCharactersInRange:range withAttributedString:subAtt];
}else {
[attStr replaceCharactersInRange:range withAttributedString:subAtt];
}
self.attributedText = attStr;
}
}
- (void)SaveEffectDicWithRange:(NSRange)range
{
self.effectDic = [NSMutableDictionary dictionary];
NSAttributedString *subAttribute = [self.attributedText attributedSubstringFromRange:range];
[self.effectDic setObject:subAttribute forKey:NSStringFromRange(range)];
}
#pragma mark - getRange
- (void)GetRangesWithStrings:(NSArray <NSString *> *)strings
{
if (self.attributedText == nil) {
self.isTapAction = NO;
return;
}
self.isTapAction = YES;
self.isTapEffect = YES;
__block NSString *totalStr = self.attributedText.string;
self.attributeStrings = [NSMutableArray array];
__weak typeof(self) weakSelf = self;
[strings enumerateObjectsUsingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
NSRange range = [totalStr rangeOfString:obj];
if (range.length != 0) {
totalStr = [totalStr stringByReplacingCharactersInRange:range withString:[weakSelf GetStringWithRange:range]];
AttributeModel *model = [[AttributeModel alloc]init];
model.range = range;
model.str = obj;
[weakSelf.attributeStrings addObject:model];
}
}];
}
- (NSString *)GetStringWithRange:(NSRange)range
{
NSMutableString *string = [NSMutableString string];
for (int i = 0; i < range.length ; i++) {
[string appendString:@" "];
}
return string;
}
@end
2、如何调用（后面都有详细注释）
1）首先头文件不要忘记了：#import "UILabel+YBAttributeTextTapAction.h"
2）然后在viewDidLoad或cell上调用就可以了：
#define UI_View_Width [UIScreen mainScreen].bounds.size.width//屏幕宽度
#define TextFont 14
- (void)viewDidLoad{
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
UILabel *label = [[UILabel alloc]init];
// label.font = [UIFont systemFontOfSize:TextFont];//写在这儿点击响应范围会出问题
NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:@"今天今天今天今天今天今天,明天明天明天明天明天明天明天明天,后天后天后天后天，昨天昨天昨天昨天昨天昨天"];
label.attributedText = string;//切记使用富文本，颜色可以自由发挥了
label.frame = CGRectMake(15, 100, UI_View_Width-30, 100);
label.numberOfLines = 0;
label.font = [UIFont systemFontOfSize:TextFont];//这个很重要,必须写在富文本下面
[self.view addSubview:label];
[label AddAttributeTapActionWithStrings:@[@"今天今天今天今天今天今天",@"明天明天明天明天明天明天明天明天",@"后天后天后天后天",@"昨天昨天昨天昨天昨天昨天"] tapClicked:^(NSString *string, NSRange range, NSInteger index) {
NSLog(@"%@",string);
}];
}
