廢話少說,直接看代碼
#import <UIKit/UIKit.h>
#define CalcPT(x) (x)
#define kVolumeCount (5)
#define kVolumeWidth CalcPT(8)
#define kVolumeMargin CalcPT(2.5)
#define kVolumeViewHeight CalcPT(24)
#define kVolumeViewWidth (kVolumeCount*kVolumeWidth+(kVolumeCount-1)*kVolumeMargin)
@interface VolumeView : UIView
- (void)setMainVolume: (CGFloat)volume maxDurtion: (CGFloat)time;
- (BOOL)setVolume: (CGFloat)volume index: (NSUInteger)index maxDurtion: (CGFloat)time;
@end
#import "VolumeView.h"
@implementation VolumeView
{
NSMutableArray <UIImageView *>*_imageViews;
}
- (instancetype)init
{
if (self = [super init])
{
_imageViews = NewMutableArray();
self.clipsToBounds = YES;
self.backgroundColor = ClearColor;
self.frame = CGRectMake(0, 0, kVolumeViewWidth, kVolumeViewHeight);
CGFloat x = 0;
for (NSUInteger a = 0; a < kVolumeCount; ++a)
{
UIImageView *iv = NewClass(UIImageView);
iv.frame = CGRectMake(x, 0, kVolumeWidth, kVolumeViewHeight);
iv.contentMode = UIViewContentModeScaleAspectFit;
iv.image = GetImageWithName(@"pic-music");
iv.backgroundColor = ClearColor;
[_imageViews addObject:iv];
[self addSubview:iv];
x += kVolumeWidth + kVolumeMargin;
}
}
return self;
}
- (BOOL)setVolume: (CGFloat)volume index: (NSUInteger)index maxDurtion: (CGFloat)time
{
const UIImageView *iv = _imageViews[index];
if (iv.tag++) return NO;
const CGFloat h = self.height;
const CGFloat y = h * (1.0f - volume);
const CGFloat d = (iv.y > y ? iv.y - y : y - iv.y) / h;
const CGFloat t = d * time;
runBlockWithMain(^{
[UIView animateWithDuration:t animations:^{
iv.y = y;
} completion:^(BOOL finished) {
iv.tag = 0;
}];
});
return YES;
}
- (void)setMainVolume: (CGFloat)volume maxDurtion: (CGFloat)time
{
const NSUInteger count = _imageViews.count;
for (NSUInteger a = 0; a < count; ++a)
{
const CGFloat x = 1 - (arc4random()%51)/100.0f;
const CGFloat v = x * volume;
[self setVolume:v index:a maxDurtion:time];
}
}
@end
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