Created
May 27, 2015 03:37
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UIImage (Utility)
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@interface UIImage (Utility) | |
+ (UIImage *)imageFromColor:(UIColor *)color; | |
-(UIImage *) getSubImage:(CGRect)rect; | |
-(UIImage *)scaleToSize:(CGSize)size; | |
+ (UIImage *)TransformtoSize:(CGSize)size image:(UIImage *)image; | |
- (UIImage *)imageWithMaxLength:(CGFloat)sideLenght; | |
@end | |
@interface UIImage (Tint) | |
- (UIImage *) imageWithTintColor:(UIColor *)tintColor; | |
- (UIImage *) imageWithGradientTintColor:(UIColor *)tintColor; | |
@end | |
#import "UIImage+Utility.h" | |
@implementation UIImage (Utility) | |
+ (UIImage *)imageFromColor:(UIColor *)color | |
{ | |
CGRect rect = CGRectMake(0, 0, 1, 1); | |
UIGraphicsBeginImageContext(rect.size); | |
CGContextRef context = UIGraphicsGetCurrentContext(); | |
CGContextSetFillColorWithColor(context,[color CGColor]); | |
CGContextFillRect(context, rect); | |
UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); | |
UIGraphicsEndImageContext(); | |
return image; | |
} | |
// 截取部分图像 | |
- (UIImage *)getSubImage:(CGRect)rect | |
{ | |
CGImageRef subImageRef = CGImageCreateWithImageInRect(self.CGImage, rect); | |
CGRect smallBounds = CGRectMake(0, 0, CGImageGetWidth(subImageRef), CGImageGetHeight(subImageRef)); | |
UIGraphicsBeginImageContext(smallBounds.size); | |
CGContextRef context = UIGraphicsGetCurrentContext(); | |
CGContextDrawImage(context, smallBounds, subImageRef); | |
UIImage *smallImage = [UIImage imageWithCGImage:subImageRef]; | |
CFRelease(subImageRef); | |
UIGraphicsEndImageContext(); | |
return smallImage; | |
} | |
// 等比例缩放 | |
- (UIImage *)scaleToSize:(CGSize)size | |
{ | |
CGFloat width = CGImageGetWidth(self.CGImage); | |
CGFloat height = CGImageGetHeight(self.CGImage); | |
float scale = [[UIScreen mainScreen] scale]; | |
float verticalRadio = size.height*scale/height; | |
float horizontalRadio = size.width*scale/width; | |
float radio = 1; | |
if (verticalRadio > 1 && horizontalRadio > 1) | |
{ | |
radio = 1; | |
} | |
else | |
{ | |
radio = verticalRadio < horizontalRadio ? verticalRadio : horizontalRadio; | |
} | |
width = width * radio; | |
height = height * radio; | |
int xPos = (size.width - width/scale)/2; | |
int yPos = (size.height - height/scale)/2; | |
UIGraphicsBeginImageContextWithOptions(size, NO,scale); | |
[self drawInRect:CGRectMake(xPos, yPos, width/scale, height/scale)]; | |
UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); | |
UIGraphicsEndImageContext(); | |
return scaledImage; | |
} | |
+ (UIImage *)TransformtoSize:(CGSize)size image:(UIImage *)image | |
{ | |
UIGraphicsBeginImageContext(size); | |
[image drawInRect:CGRectMake(0, 0, size.width, size.height)]; | |
UIImage *transformedImg=UIGraphicsGetImageFromCurrentImageContext(); | |
UIGraphicsEndImageContext(); | |
return transformedImg; | |
} | |
- (UIImage *)imageWithMaxLength:(CGFloat)sideLenght | |
{ | |
CGSize size = [self fitSize:sideLenght]; | |
UIGraphicsBeginImageContext(size); | |
CGContextSetInterpolationQuality(UIGraphicsGetCurrentContext(), kCGInterpolationDefault); | |
CGRect rect = CGRectMake(0, 0, size.width, size.height); | |
[self drawInRect:rect]; | |
UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext(); | |
UIGraphicsEndImageContext(); | |
return newimg; | |
} | |
- (CGSize)fitSize:(CGFloat)sideLenght | |
{ | |
CGFloat scale; | |
CGSize newsize; | |
if(self.size.width <= sideLenght && self.size.height <= sideLenght) | |
{ | |
newsize = self.size; | |
} | |
else | |
{ | |
if(self.size.width >= self.size.height) | |
{ | |
scale = sideLenght/self.size.width; | |
newsize.width = sideLenght; | |
newsize.height = ceilf(self.size.height*scale); | |
} | |
else | |
{ | |
scale = sideLenght/self.size.height; | |
newsize.height = sideLenght; | |
newsize.width = ceilf(self.size.width*scale); | |
} | |
} | |
return newsize; | |
} | |
@end | |
@implementation UIImage (Tint) | |
- (UIImage *) imageWithTintColor:(UIColor *)tintColor | |
{ | |
return [self imageWithTintColor:tintColor blendMode:kCGBlendModeDestinationIn]; | |
} | |
- (UIImage *) imageWithGradientTintColor:(UIColor *)tintColor | |
{ | |
return [self imageWithTintColor:tintColor blendMode:kCGBlendModeOverlay]; | |
} | |
- (UIImage *) imageWithTintColor:(UIColor *)tintColor blendMode:(CGBlendMode)blendMode | |
{ | |
//We want to keep alpha, set opaque to NO; Use 0.0f for scale to use the scale factor of the device’s main screen. | |
UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f); | |
[tintColor setFill]; | |
CGRect bounds = CGRectMake(0, 0, self.size.width, self.size.height); | |
UIRectFill(bounds); | |
//Draw the tinted image in context | |
[self drawInRect:bounds blendMode:blendMode alpha:1.0f]; | |
if (blendMode != kCGBlendModeDestinationIn) { | |
[self drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:1.0f]; | |
} | |
UIImage *tintedImage = UIGraphicsGetImageFromCurrentImageContext(); | |
UIGraphicsEndImageContext(); | |
return tintedImage; | |
} | |
@end | |
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