#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

#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

    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;