我在我的應用程序中有一個語音備忘錄組件,我想讓用戶修剪音頻,類似於Mac OS上的QuickTime X十點六處理它,或者像Voice Memos應用程序蘋果手機。這裏有兩個例子:iPhone trim音頻錄製
任何幫助表示讚賞。
我在我的應用程序中有一個語音備忘錄組件,我想讓用戶修剪音頻,類似於Mac OS上的QuickTime X十點六處理它,或者像Voice Memos應用程序蘋果手機。這裏有兩個例子:iPhone trim音頻錄製
任何幫助表示讚賞。
我不是一個UI程序員。這是我寫的一個測試,看看如何編寫自定義控件。此代碼可能會或可能不會工作。我有一段時間沒有觸及它。
頭
@interface SUIMaxSlider : UIControl {
@private
float_t minimumValue;
float_t maximumValue;
float_t value;
CGPoint trackPoint;
}
@property (nonatomic, assign) float_t minimumValue, maximumValue;
@property (nonatomic, assign) float_t value;
@end
實施
#import "SUIMaxSlider.h"
#import <CoreGraphics/CoreGraphics.h>
#import <QuartzCore/QuartzCore.h>
//#import "Common.h"
#define kSliderPadding 5
@implementation SUIMaxSlider
@synthesize minimumValue, maximumValue;
#pragma mark -
#pragma mark Interface Initialization
- (id) initWithCoder:(NSCoder *)aDecoder {
if (self = [super initWithCoder:aDecoder]) {
trackPoint.x = self.bounds.size.width;
self.backgroundColor = [UIColor colorWithRed:135.0/255.0 green:173.0/255.0 blue:255.0/255.0 alpha:0.0];
}
return self;
}
- (id) initWithFrame: (CGRect) aFrame {
if (self = [super initWithFrame:aFrame]) {
self.frame = aFrame;
self.bounds = aFrame;
self.center = CGPointMake(CGRectGetMidX(aFrame), CGRectGetMidY(aFrame));
trackPoint.x = aFrame.size.width;
}
return self;
}
- (id) init {
return [self initWithFrame:CGRectZero];
}
#pragma mark -
#pragma mark Properties.
#pragma mark -
- (float_t) value {
return value;
}
- (void) setValue:(float_t) v {
value = fmin(v, maximumValue);
value = fmax(value, minimumValue);
float_t delta = maximumValue - minimumValue;
float_t scalar = ((self.bounds.size.width - 2 * kSliderPadding)/delta) ;
float_t x = (value - minimumValue) * scalar;
x += 5.0;
trackPoint.x = x;
[self setNeedsDisplay];
}
#pragma mark -
#pragma mark Interface Drawing
#pragma mark -
- (void) drawRect:(CGRect) rect {
CGContextRef context = UIGraphicsGetCurrentContext();
CGColorRef lightBlue = [UIColor colorWithRed:135.0/255.0 green:173.0/255.0 blue:255.0/255.0 alpha:1.0].CGColor;
CGColorRef lightBlueAlpha = [UIColor colorWithRed:135.0/255.0 green:173.0/255.0 blue:255.0/255.0 alpha:0.7].CGColor;
CGColorRef lightGrayColor = [UIColor colorWithRed:130.0/255.0 green:130.0/255.0 blue:130.0/255.0 alpha:1.0].CGColor;
CGColorRef darkGrayColor = [UIColor colorWithRed:70.0/255.0 green:70.0/255.0 blue:70.0/255.0 alpha:1.0].CGColor;
CGColorRef redColor = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:0.6].CGColor;
CGRect boundsRect = self.bounds;
CGRect sliderRect = CGRectMake(0, 0, boundsRect.size.width, boundsRect.size.height/2);
/*
CGContextSetFillColorWithColor(context, lightGrayColor);
CGContextFillRect(context, sliderRect);
halfHeight.origin.y = sliderRect.size.height;
CGContextSetFillColorWithColor(context, darkGrayColor);
CGContextFillRect(context, sliderRect);
*/
CGFloat tx = fmin(sliderRect.size.width - kSliderPadding, trackPoint.x);
tx = fmax(kSliderPadding, tx);
sliderRect.origin.y = boundsRect.origin.y;
sliderRect.size.width = tx ;
CGContextSetFillColorWithColor(context, lightBlueAlpha);
CGContextFillRect(context, sliderRect);
sliderRect.origin.y = sliderRect.size.height;
CGContextSetFillColorWithColor(context, lightBlue);
CGContextFillRect(context, sliderRect);
CGFloat mid = boundsRect.size.height/2 ;
CGPoint a = CGPointMake(tx - kSliderPadding, mid);
CGPoint b = CGPointMake(tx, mid - kSliderPadding);
CGPoint c = CGPointMake(tx + kSliderPadding, mid);
CGPoint d = CGPointMake(tx, mid + kSliderPadding);
CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0);
CGContextSetLineWidth(context, 2.0);
CGContextBeginPath(context);
CGContextMoveToPoint(context, a.x, a.y);
CGContextAddLineToPoint(context, b.x, b.y);
CGContextAddLineToPoint(context, c.x, c.y);
CGContextAddLineToPoint(context, d.x, d.y);
CGContextAddLineToPoint(context, a.x, a.y);
CGContextFillPath(context);
}
#pragma mark -
#pragma mark Touch Tracking
#pragma mark -
- (void) trackTouch:(UITouch *) touch {
CGPoint p = [touch locationInView:self];
//bound track point
trackPoint.x = fmax(p.x, kSliderPadding) ;
trackPoint.x = fmin(trackPoint.x, self.bounds.size.width - kSliderPadding);
[self setNeedsDisplay];
float_t x = trackPoint.x - kSliderPadding;
float_t delta = maximumValue - minimumValue;
float_t scalar = (x/(self.bounds.size.width - 2 * kSliderPadding)) ;
value = minimumValue + (delta * scalar);
[self sendActionsForControlEvents:UIControlEventValueChanged];
}
- (void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
[self trackTouch:touch];
}
- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
CGPoint p = [touch locationInView:self];
trackPoint.x = fmax(p.x, kSliderPadding) ;
trackPoint.x = fmin(trackPoint.x, self.bounds.size.width - kSliderPadding);
[self setNeedsDisplay];
return YES;
}
- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
[self trackTouch:touch];
return YES;
}
@end
謝謝,這工作得很好!我正在擴展它以提供所需的用戶界面。 – 2011-03-27 18:54:24
很好用。 [Ray Wenderlich](http://www.raywenderlich.com/tutorials)有幾篇關於使用核心圖形和自定義控件的入門教程。 – 2011-03-27 19:22:47
看看AVMutableCompositionTrack removeTimeRange。 – 2011-03-26 01:54:54
這就是我將用來做底層的工作,但對我來說真正的問題實際上是製作那個UI。也許把它轉換成靜止的視頻,編輯它,然後將其轉換回來可能會給我提供一種很好的方式去做事情? – 2011-03-26 03:21:50
我會在自定義控件中使用Core Graphics。我發佈了一個示例滑塊,我做了一段時間後作爲答案。 – 2011-03-27 17:29:52