根据颜色返回图片，根据str返回颜色，压缩UIImage不大于300k
.h代码：
#import <Foundation/Foundation.h> @interface ImageService : NSObject
/**
根据颜色返回图片
*/
+(UIImage*) createImageWithColor:(UIColor*) color;
/**
根据str返回颜色
*/
+ (UIColor *) colorWithHexString: (NSString *)color;
//获取data不大于300k
+ (NSData *)compressOriginalImage:(UIImage *)image;
@end
.m代码：
#import "ImageService.h" @implementation ImageService //color转image
+(UIImage*) createImageWithColor:(UIColor*) color
{
CGRect rect=CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}
//str转color
+ (UIColor *) colorWithHexString: (NSString *)color
{
NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString]; // String should be 6 or 8 characters
if ([cString length] < 6) {
return [UIColor clearColor];
}
// strip 0X if it appears
if ([cString hasPrefix:@"0X"])
cString = [cString substringFromIndex:2];
if ([cString hasPrefix:@"#"])
cString = [cString substringFromIndex:1];
if ([cString length] != 6)
return [UIColor clearColor]; // Separate into r, g, b substrings
NSRange range;
range.location = 0;
range.length = 2; //r
NSString *rString = [cString substringWithRange:range]; //g
range.location = 2;
NSString *gString = [cString substringWithRange:range]; //b
range.location = 4;
NSString *bString = [cString substringWithRange:range]; // Scan values
unsigned int r, g, b;
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b]; return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f];
}
+ (NSData *)compressOriginalImage:(UIImage *)image{
NSData * data = UIImageJPEGRepresentation(image, 1.0);
CGFloat dataKBytes = data.length/1000.0;
CGFloat maxQuality = 0.9f;
CGFloat lastData = dataKBytes;
while (dataKBytes > 10 && maxQuality > 0.01f) {
maxQuality = maxQuality - 0.01f;
data = UIImageJPEGRepresentation(image, maxQuality);
dataKBytes = data.length / 1000.0;
if (lastData == dataKBytes) {
break;
}else{
lastData = dataKBytes;
}
}
return data;
} @end
头像压缩代码：
NSData * data = UIImageJPEGRepresentation(image, 1.0);
CGFloat dataSizeM = data.length/1024.0/1024.0;
if(dataSizeM>1.0){
data = UIImageJPEGRepresentation(image, 0.1);
}else if(dataSizeM>0.8){
data = UIImageJPEGRepresentation(image, 0.8);
}else if(dataSizeM>0.5){
data = UIImageJPEGRepresentation(image, 0.6);
}
return data;