由于这个动画只有在真机上才可以看到gif效果，所以贴上几张图让各位看看运行的效果。
IMG_0396.jpg
IMG_0394.jpg
IMG_0397.jpg
IMG_0398.jpg
从效果图上可以看出，此动画需要的组件有：
1.好看的话筒
2.两边向外延伸的线条
3.中间的波纹的延伸
此动画需要用到的知识有：
1.UIView 的Animation
2.开启和关闭系统的麦克风
注意：该动画在真机上可以运行，如果在模拟器上的话，会运行不起。
在写代码之前记住引入，当然你得添加那个AVFoundation框架
#import <AVFoundation/AVFoundation.h>
定义视图上的组件：
//话筒的视图
@property (nonatomic, strong) UIImageView *imageView;
//话筒右侧的延伸线条
@property (nonatomic, strong) DyLineView *lineView;
//话筒左侧的延伸线条
@property (nonatomic, strong) DyLineView *leftLineView;
//记录语音的对象
@property (nonatomic, strong) AVAudioRecorder *recorder;
//向外延伸的波纹视图
@property (nonatomic, strong) UIView *RippleView;
各组件对象的创建：
- (void)configView
{
self.RippleView = [[UIView alloc] initWithFrame:(CGRect){0,0,90,90}];
self.RippleView.backgroundColor = [[UIColor redColor] colorWithAlphaComponent:0.8];
self.RippleView.layer.cornerRadius = 45;
self.RippleView.center = self.view.center;
self.RippleView.layer.masksToBounds=true;
self.RippleView.alpha=0;
[self imageWithPoint:self.view.center];
self.imageView = [UIImageView new];
self.imageView.size = CGSizeMake(60, 60);
self.imageView.image = [UIImage imageNamed:@"input_btn_recording"];
[self.view addSubview:self.imageView];
self.imageView.center = self.view.center;
self.lineView = [[DyLineView alloc] initWithFrame:CGRectMake(self.view.centerX + 40, 0 , 100, 60)];
self.lineView.centerY = self.view.centerY;
[self.view addSubview:self.lineView];
self.leftLineView = [[DyLineView alloc] initWithFrame:CGRectMake(0, 0 , 100, 60)];
self.leftLineView.right = self.imageView.left - 10;
self.leftLineView.centerY = self.view.centerY;
[self.view addSubview:self.leftLineView];
NSError *setCategoryError = nil;
[[AVAudioSession sharedInstance] setActive:YES error:nil];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error: &setCategoryError];
NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat: 44100.0], AVSampleRateKey,
[NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey,
[NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
[NSNumber numberWithInt: AVAudioQualityMax], AVEncoderAudioQualityKey,
nil];
NSError *error;
self.recorder = [[AVAudioRecorder alloc] initWithURL:[NSURL fileURLWithPath:@"dev/null"] settings:settings error:&error];
if (self.recorder) {
[self.recorder prepareToRecord];
self.recorder.meteringEnabled = YES;
}
else{
NSLog(@"init recorder failed");
}
[self startRecordIfMicrophoneEnabled];
}
下面就开启麦克风操作
- (void)startRecordIfMicrophoneEnabled
{
if ([[AVAudioSession sharedInstance] respondsToSelector:@selector(requestRecordPermission:)]) {
__weak typeof(self) wself = self;
[[AVAudioSession sharedInstance] performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {
if (granted) {
// Microphone enabled code
NSLog(@"Microphone is enabled..");
[wself startRecord];
}
else {
// Microphone disabled code
NSLog(@"Microphone is disabled..");
// We're in a background thread here, so jump to main thread to do UI work.
dispatch_async(dispatch_get_main_queue(), ^{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"麦克风不可用" message:@"该应用需要访问您的麦克风，请到设置/隐私/麦克风，开启" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil, nil];
[alertView show];
});
}
}];
}
else{
[self startRecord];
}
}
开启录音并根据麦克风的声音的分贝来控制话筒两侧的线条的高度
- (void)startRecord
{
[self.recorder record];
[self performSelector:@selector(getDecibelValue) withObject:nil afterDelay:0];
}
- (void)getDecibelValue
{
[self.recorder updateMeters];
float level; // The linear 0.0 .. 1.0 value we need.
float minDecibels = -60; // Or use -60dB, which I measured in a silent room.
float decibels = [self.recorder averagePowerForChannel:0];
if (decibels < minDecibels)
{
level = 0.0f;
}
else if (decibels >= 0.0f)
{
level = 1.0f;
}
else
{
float root = 2.0f;
float minAmp = powf(10.0f, 0.05f * minDecibels);
float inverseAmpRange = 1.0f / (1.0f - minAmp);
float amp = powf(10.0f, 0.05f * decibels);
float adjAmp = (amp - minAmp) * inverseAmpRange;
level = powf(adjAmp, 1.0f / root);
}
[self.lineView addWaveWithDecibelValue:level * 100 directionLeft:NO];
[self.leftLineView addWaveWithDecibelValue:level * 100 directionLeft:YES];
[self performSelector:@selector(getDecibelValue) withObject:nil afterDelay:0.1];
NSLog(@"平均值 %f", level * 120);
}
接着是话筒的波纹动画,利用UIView的Animation和视图的alpha来进行实现。
- (void)imageWithPoint:(CGPoint)point
{
CGPoint location = self.view.center;
[self.view addSubview:self.RippleView];
self.RippleView.layer.zPosition = -1;
self.RippleView.center = location;
self.RippleView.transform = CGAffineTransformMakeScale(0.5, 0.5);
[UIView animateWithDuration:1.0
animations:^{
self.RippleView.alpha=1;
}];
[UIView animateWithDuration:1.0
delay:0
options:UIViewAnimationOptionCurveEaseInOut
animations:^{
self.RippleView.transform = CGAffineTransformMakeScale(1,1);
self.RippleView.alpha=0;
self.view.alpha=1;
} completion:^(BOOL finished) {
[self.RippleView removeFromSuperview];
[self performSelector:@selector(imageWithPoint:) withObject:nil afterDelay:1.0];
}];
}
最后是关闭录音对象，如果不关闭就会发生内存泄露。
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
[self.recorder stop];
[NSObject cancelPreviousPerformRequestsWithTarget:self];
}
这个类中用到了DyLineView这个类，现在就看看这个线条的延伸是怎么实现的。
在这个类中一个公有方法：
- (void)addWaveWithDecibelValue:(NSInteger)decibel directionLeft:(BOOL)left
{
NSInteger level = ceilf(decibel / 20.0);
if (level > 0) {
if (level > 5) {
level = 5;
}
if (decibel > self.height) {
decibel = decibel * 0.9;
if (decibel > self.height) {
decibel = self.height;
}
}else if (decibel < 15) {
decibel = 3;
}
UIView *lineView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 2.0, decibel)];
lineView.layer.cornerRadius = 1.5;
lineView.clipsToBounds = YES;
if (left) {
lineView.left = self.width;
}
lineView.backgroundColor = [UIColor redColor];
lineView.centerY = self.height/2.0;
[self addSubview:lineView];
[UIView transitionWithView:lineView duration:1.8 options:UIViewAnimationOptionCurveLinear animations:^{
if (left) {
lineView.centerX = 0;
}else {
lineView.centerX = self.width;
}
} completion:^(BOOL finished) {
[lineView removeFromSuperview];
}];
}
}
这样题目的那个动画效果就实现了。
下面给出的github上得地址，是我之前博客中的所有代码，并且有一些是没有写出来的。如果你需要的话，可以看看。
地址
