iOS 提示文字 类似微信拍摄小视频“手指不要放开”

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent
*)event

{

    NSLog(@"touchesEnded");

    

    UITouch *touch = [touches
anyObject];

    CGPoint point = [touch
locationInView:self.view];

    BOOL condition = [self
isInBtnRect:point];

    /*

     结束时候咱们设定有两种情况依然算录制成功

     1.抬手时,录制时长 > 1/3总时长

     2.录制进度条完成时,就算手指超出按钮范围也算录制成功 --
此时 end
方法不会调用,因为用户手指还在屏幕上,所以直接代码调用录制成功的方法,将控制器切换

     */

    

    if (condition) {

        NSLog(@"手指还在按钮范围之内");

        

        if (self.progressWidth.constant
< SCREEN_WIDTH *
0.67) {

            //录制完成

            [self
recordComplete];

        }else{

//            showAtTop(@"手指不要放开");

//            [ToastUtils showAtTop:[NSString stringWithFormat:@"ToastUtils"]];

            [ToastUtils
showToast:[NSString
stringWithFormat:@"手指不要放开"]
atFrameY:SCREEN_HEIGHT -
130];

        }

    }

    

    [self
stopAnimation];

    self.changeBtn.hidden =
self.flashModelBtn.hidden =
NO;

}

+ (void)showToast:(NSString *)message atFrameY:(CGFloat)frameY{

    [self
show:message atFrameY:frameY
showTime:2.0];

    

}

static UILabel *toastView =
nil;

+ (void)show:(NSString *)message atFrameY:(CGFloat)frameY showTime:(float)showTime{

    if (![[NSThread
currentThread] isMainThread]) {

        dispatch_async(dispatch_get_main_queue(), ^{

            [self
show:message atFrameY:frameY
showTime:showTime];

        });

        return;

    }

    @synchronized(self){

        if (toastView ==
nil) {

            toastView = [[UILabel
alloc] init];

            toastView.backgroundColor =
REDCOLOR;

            toastView.textColor = [UIColor
whiteColor];

            toastView.font = [UIFont
systemFontOfSize:17];

            toastView.layer.masksToBounds =
YES;

            toastView.layer.cornerRadius =
3.0f;

            toastView.textAlignment =
NSTextAlignmentCenter;

            toastView.alpha =
0;

            toastView.numberOfLines =
0;

            toastView.lineBreakMode =
NSLineBreakByCharWrapping;

            [[UIApplication
sharedApplication].keyWindow
addSubview:toastView];

        }

    }

    if (toastView.superview != [UIApplication
sharedApplication].keyWindow) {

        [toastView
removeFromSuperview];

        [[UIApplication
sharedApplication].keyWindow
addSubview:toastView];

    }

    

    //    CGFloat screenWidth = [[UIScreen mainScreen] bounds].size.width;

    

    CGFloat width = [self
stringText:message
font:18
isHeightFixed:YES
fixedValue:30];

    CGFloat height =
30;

    if (width >
screenWidth - 20) {

        width = screenWidth -
20;

        height = [self
stringText:message
font:18
isHeightFixed:NO
fixedValue:width];

    }

    

    CGRect frame =
CGRectMake(([UIScreen
mainScreen].bounds.size.width-width)/2,frameY,
width, height);

    toastView.alpha =
1;

    toastView.text = message;

    toastView.frame = frame;

    [UIView
animateWithDuration:showTime
animations:^{

        toastView.alpha =
0;

    } completion:^(BOOL finished) {

    }];

}

//根据字符串长度获取对应的宽度或者高度

+ (CGFloat)stringText:(NSString *)text font:(CGFloat)font isHeightFixed:(BOOL)isHeightFixed
fixedValue:(CGFloat)fixedValue

{

    CGSize size;

    if (isHeightFixed) {

        size = CGSizeMake(MAXFLOAT, fixedValue);

    } else {

        size = CGSizeMake(fixedValue,
MAXFLOAT);

    }

    

    CGSize resultSize;

    //返回计算出的size

    resultSize = [text boundingRectWithSize:size
options:NSStringDrawingTruncatesLastVisibleLine |
NSStringDrawingUsesFontLeading |
NSStringDrawingUsesLineFragmentOrigin
attributes:@{NSFontAttributeName: [UIFont
systemFontOfSize:font]}
context:nil].size;

    

    if (isHeightFixed) {

        return resultSize.width;

    } else {

        return resultSize.height;

    }

}