iOS 渐变进度条

#import <UIKit/UIKit.h>

@interface JianBianView : UIView

//为了增加一个表示进度条的进行，可们可以使用mask属性来屏蔽一部分

@property (nonatomic, strong) CALayer *maskLayer;

@property (nonatomic, assign) CGFloat progress;

//动画方法

-(void)performAnimation;

-(void)setProgress:(CGFloat)value;

@end

#import "JianBianView.h"

@implementation JianBianView

@synthesize maskLayer,progress;

+(Class)layerClass

{

//设置默认是 CAGradientLayer

return [CAGradientLayer class];

}

-(id)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self)

{

maskLayer = [CALayer layer];

[maskLayer setFrame:CGRectMake(0, 0, 0, frame.size.height)];

[maskLayer setBackgroundColor:[UIColor blackColor].CGColor];

CAGradientLayer *layer = (id)[self layer];

[layer setStartPoint:CGPointMake(0.0, 0.5)];

[layer setEndPoint:CGPointMake(1.0, 0.5)];

NSMutableArray *colors = [[NSMutableArray alloc] init];

for (NSInteger hue = 0; hue < 360; hue += 5)

{

UIColor *color;

//hue 色调 saturation 饱和度 brightness 亮度

color = [UIColor colorWithHue:1.0*hue/360.0 saturation:1.0 brightness:1.0 alpha:1.0];

[colors addObject:(id)[color CGColor]];

}

[layer setColors:[NSArray arrayWithArray:colors]];

[layer setMask:maskLayer];

}

return self;

}

//创建一个宽度为0的mask覆盖整个View，mask的颜色不重要，当我们progress属性更新的时候我们会增加它的宽度 然后在initWithFrame:里面添加：

/*

maskLayer = [CALayer layer];

[maskLayer setFrame:CGRectMake(0, 0, 0, frame.size.height)];

[maskLayer setBackgroundColor:[UIColor blackColor].CGColor];

*/

//所以重写setProgress:

-(void)setProgress:(CGFloat)value

{

if (progress != value)

{

progress = MIN(1.0, fabs(value));

[self setNeedsLayout];

}

}

-(void)layoutSubviews

{

CGRect maskRect = [maskLayer frame];

maskRect.size.width = CGRectGetWidth([self bounds]) * progress;

[maskLayer setFrame:maskRect];

}

-(void)performAnimation

{

// Move the last color in the array to the front

// shifting all the other colors.

CAGradientLayer *layer = (id)[self layer];

NSMutableArray *mutable = [[layer colors] mutableCopy];

id lastColor = [mutable lastObject];

[mutable removeLastObject];

[mutable insertObject:lastColor atIndex:0];

NSArray *shiftColors = [NSArray arrayWithArray:mutable];

[layer setColors:shiftColors];

CABasicAnimation *animation;

animation = [CABasicAnimation animationWithKeyPath:@"Colors"];

[animation setToValue:shiftColors];

[animation setDuration:0.08];

[animation setRemovedOnCompletion:YES];

[animation setFillMode:kCAFillModeForwards];

[animation setDelegate:self];

[layer addAnimation:animation forKey:@""];

}

-(void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag

{

[self performAnimation];

}

@end

视图控制器 调用

- (void)viewDidLoad

{

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

self.title = @"渐变测试";

self.view.backgroundColor = [UIColor whiteColor];

//    [self jianBianMethord];

[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timeMethod) userInfo:nil repeats:YES];

[self addJianBianView];

}

-(void)timeMethod

{

NSLog(@"进入");

progress += 0.1;

[self.jianBianView setProgress:progress];

}

//-----------添加渐变view

-(void)addJianBianView

{

if (self.jianBianView == nil)

{

self.jianBianView = [[JianBianView alloc] initWithFrame:CGRectMake(0, 100, self.view.frame.size.width, 10)];

[self.view addSubview:self.jianBianView];

[self.jianBianView performAnimation];

}

}