iOS UITextView點擊事件處理

自定義一個UITextView

UITextView 的selectedRange 影響 selectedTextRange 改變前者可影響后者

self.selectedRange -->self.selectedTextRange

@implementation HWStatusTextView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
        self.editable = NO;
　　　　//改變文字內邊距
        self.textContainerInset = UIEdgeInsetsMake(0, -5, 0, -5);
        // 禁止滾動, 讓文字完全顯示出來
        self.scrollEnabled = NO;
    }
    return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    // 觸摸對象
    UITouch *touch = [touches anyObject];
    
    // 觸摸點
    CGPoint point = [touch locationInView:self];
    
    NSArray *specials = [self.attributedText attribute:@"specials" atIndex:0 effectiveRange:NULL];
    BOOL contains = NO;
    
    for (HWSpecial *special in specials) {
        self.selectedRange = special.range;
        // self.selectedRange --影響--> self.selectedTextRange
        // 獲得選中范圍的矩形框
        NSArray *rects = [self selectionRectsForRange:self.selectedTextRange];
        // 清空選中范圍
        self.selectedRange = NSMakeRange(0, 0);
        
        for (UITextSelectionRect *selectionRect in rects) {
            CGRect rect = selectionRect.rect;
            if (rect.size.width == 0 || rect.size.height == 0) continue;
            
            if (CGRectContainsPoint(rect, point)) { // 點中了某個特殊字符串
                contains = YES;
                break;
            }
        }
        
        if (contains) {
            for (UITextSelectionRect *selectionRect in rects) {
                CGRect rect = selectionRect.rect;
                if (rect.size.width == 0 || rect.size.height == 0) continue;
                
                UIView *cover = [[UIView alloc] init];
                cover.backgroundColor = [UIColor greenColor];
                cover.frame = rect;
                cover.tag = HWStatusTextViewCoverTag;
                cover.layer.cornerRadius = 5;
                [self insertSubview:cover atIndex:0];
            }
            
            break;
        }
    }
    
    // 在被觸摸的特殊字符串后面顯示一段高亮的背景
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.25 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [self touchesCancelled:touches withEvent:event];
    });
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    // 去掉特殊字符串后面的高亮背景
    for (UIView *child in self.subviews) {
        if (child.tag == HWStatusTextViewCoverTag) [child removeFromSuperview];
    }
}
@end