随笔 - 93  文章 - 1 评论 - 7 阅读 - 45095
< 2025年2月 >
26 27 28 29 30 31 1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 1
2 3 4 5 6 7 8

转自:http://prolove10.blog.163.com/blog/static/138411843201391401054305/

原图:

ios7新API——实现毛玻璃效果 - prolove10 - AngelLee的博客

 效果图:

ios7新API——实现毛玻璃效果 - prolove10 - AngelLee的博客

 实现:
首先需要导入Accelerate.framework。
然后把两个文件加入到自己的项目中即可。
UIImage+ImageEffects.h

1
2
3
4
5
6
7
8
9
10
11
12
#import
 
@interfaceUIImage(ImageEffects)
 
-(UIImage*)applyLightEffect;
-(UIImage*)applyExtraLightEffect;
-(UIImage*)applyDarkEffect;
-(UIImage*)applyTintEffectWithColor:(UIColor*)tintColor;
 
-(UIImage*)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor*)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage*)maskImage;
 
@end

UIImage+ImageEffects.m

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
#import "UIImage+ImageEffects.h"
 
#import
#import
 
 
@implementationUIImage(ImageEffects)
 
 
-(UIImage*)applyLightEffect
{
UIColor*tintColor =[UIColor colorWithWhite:1.0 alpha:0.3];
return[self applyBlurWithRadius:30 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
}
 
 
-(UIImage*)applyExtraLightEffect
{
UIColor*tintColor =[UIColor colorWithWhite:0.97 alpha:0.82];
return[self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
}
 
 
-(UIImage*)applyDarkEffect
{
UIColor*tintColor =[UIColor colorWithWhite:0.11 alpha:0.73];
return[self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
}
 
 
-(UIImage*)applyTintEffectWithColor:(UIColor*)tintColor
{
constCGFloatEffectColorAlpha=0.6;
UIColor*effectColor = tintColor;
int componentCount =CGColorGetNumberOfComponents(tintColor.CGColor);
if(componentCount ==2){
CGFloat b;
if([tintColor getWhite:&b alpha:NULL]){
effectColor =[UIColor colorWithWhite:b alpha:EffectColorAlpha];
}
}
else{
CGFloat r, g, b;
if([tintColor getRed:&r green:&g blue:&b alpha:NULL]){
effectColor =[UIColor colorWithRed:r green:g blue:b alpha:EffectColorAlpha];
}
}
return[self applyBlurWithRadius:10 tintColor:effectColor saturationDeltaFactor:-1.0 maskImage:nil];
}
 
 
-(UIImage*)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor*)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage*)maskImage
{
// Check pre-conditions.
if(self.size.width <1||self.size.height <1){
NSLog(@"*** error: invalid size: (%.2f x %.2f). Both dimensions must be >= 1: %@",self.size.width,self.size.height,self);
returnnil;
}
if(!self.CGImage){
NSLog(@"*** error: image must be backed by a CGImage: %@",self);
returnnil;
}
if(maskImage &&!maskImage.CGImage){
NSLog(@"*** error: maskImage must be backed by a CGImage: %@", maskImage);
returnnil;
}
 
CGRect imageRect ={CGPointZero,self.size };
UIImage*effectImage =self;
 
BOOL hasBlur = blurRadius > __FLT_EPSILON__;
BOOL hasSaturationChange = fabs(saturationDeltaFactor -1.)> __FLT_EPSILON__;
if(hasBlur || hasSaturationChange){
UIGraphicsBeginImageContextWithOptions(self.size, NO,[[UIScreen mainScreen] scale]);
CGContextRef effectInContext =UIGraphicsGetCurrentContext();
CGContextScaleCTM(effectInContext,1.0,-1.0);
CGContextTranslateCTM(effectInContext,0,-self.size.height);
CGContextDrawImage(effectInContext, imageRect,self.CGImage);
 
vImage_Buffer effectInBuffer;
effectInBuffer.data =CGBitmapContextGetData(effectInContext);
effectInBuffer.width =CGBitmapContextGetWidth(effectInContext);
effectInBuffer.height =CGBitmapContextGetHeight(effectInContext);
effectInBuffer.rowBytes =CGBitmapContextGetBytesPerRow(effectInContext);
 
UIGraphicsBeginImageContextWithOptions(self.size, NO,[[UIScreen mainScreen] scale]);
CGContextRef effectOutContext =UIGraphicsGetCurrentContext();
vImage_Buffer effectOutBuffer;
effectOutBuffer.data =CGBitmapContextGetData(effectOutContext);
effectOutBuffer.width =CGBitmapContextGetWidth(effectOutContext);
effectOutBuffer.height =CGBitmapContextGetHeight(effectOutContext);
effectOutBuffer.rowBytes =CGBitmapContextGetBytesPerRow(effectOutContext);
 
if(hasBlur){
// A description of how to compute the box kernel width from the Gaussian
// radius (aka standard deviation) appears in the SVG spec:
// http://www.w3.org/TR/SVG/filters.html#feGaussianBlurElement
//
// For larger values of 's' (s >= 2.0), an approximation can be used: Three
// successive box-blurs build a piece-wise quadratic convolution kernel, which
// approximates the Gaussian kernel to within roughly 3%.
//
// let d = floor(s * 3*sqrt(2*pi)/4 + 0.5)
//
// ... if d is odd, use three box-blurs of size 'd', centered on the output pixel.
//
CGFloat inputRadius = blurRadius *[[UIScreen mainScreen] scale];
NSUInteger radius = floor(inputRadius *3.* sqrt(2* M_PI)/4+0.5);
if(radius %2!=1){
radius +=1;// force radius to be odd so that the three box-blur methodology works.
}
vImageBoxConvolve_ARGB8888(&effectInBuffer,&effectOutBuffer, NULL,0,0, radius, radius,0, kvImageEdgeExtend);
vImageBoxConvolve_ARGB8888(&effectOutBuffer,&effectInBuffer, NULL,0,0, radius, radius,0, kvImageEdgeExtend);
vImageBoxConvolve_ARGB8888(&effectInBuffer,&effectOutBuffer, NULL,0,0, radius, radius,0, kvImageEdgeExtend);
}
BOOL effectImageBuffersAreSwapped = NO;
if(hasSaturationChange){
CGFloat s = saturationDeltaFactor;
CGFloat floatingPointSaturationMatrix[]={
0.0722+0.9278* s,0.0722-0.0722* s,0.0722-0.0722* s,0,
0.7152-0.7152* s,0.7152+0.2848* s,0.7152-0.7152* s,0,
0.2126-0.2126* s,0.2126-0.2126* s,0.2126+0.7873* s,0,
0,0,0,1,
};
constint32_t divisor =256;
NSUInteger matrixSize =sizeof(floatingPointSaturationMatrix)/sizeof(floatingPointSaturationMatrix[0]);
int16_t saturationMatrix[matrixSize];
for(NSUInteger i =0; i < matrixSize;++i){
saturationMatrix[i]=(int16_t)roundf(floatingPointSaturationMatrix[i]* divisor);
}
if(hasBlur){
vImageMatrixMultiply_ARGB8888(&effectOutBuffer,&effectInBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);
effectImageBuffersAreSwapped = YES;
}
else{
vImageMatrixMultiply_ARGB8888(&effectInBuffer,&effectOutBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);
}
}
if(!effectImageBuffersAreSwapped)
effectImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
 
if(effectImageBuffersAreSwapped)
effectImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
 
// Set up output context.
UIGraphicsBeginImageContextWithOptions(self.size, NO,[[UIScreen mainScreen] scale]);
CGContextRef outputContext =UIGraphicsGetCurrentContext();
CGContextScaleCTM(outputContext,1.0,-1.0);
CGContextTranslateCTM(outputContext,0,-self.size.height);
 
// Draw base image.
CGContextDrawImage(outputContext, imageRect,self.CGImage);
 
// Draw effect image.
if(hasBlur){
CGContextSaveGState(outputContext);
if(maskImage){
CGContextClipToMask(outputContext, imageRect, maskImage.CGImage);
}
CGContextDrawImage(outputContext, imageRect, effectImage.CGImage);
CGContextRestoreGState(outputContext);
}
 
// Add in color tint.
if(tintColor){
CGContextSaveGState(outputContext);
CGContextSetFillColorWithColor(outputContext, tintColor.CGColor);
CGContextFillRect(outputContext, imageRect);
CGContextRestoreGState(outputContext);
}
 
// Output image is ready.
UIImage*outputImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
 
return outputImage;
}
 
 
@end

调用:

1
2
3
UIImageView*me =[[UIImageView alloc] initWithFrame:CGRectMake(10,480,614,381)];
[me setImage:[[UIImage imageNamed:@"me.png"] applyBlurWithRadius:5 tintColor:[UIColor colorWithWhite:1 alpha:0.2] saturationDeltaFactor:1.8 maskImage:nil]];
[self.view addSubview:me];

ok!So easy!

posted on   М80メ  阅读(287)  评论(0编辑  收藏  举报
点击右上角即可分享
微信分享提示