iOS 随机颜色（UIColor）

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#import @interface UIColor (RandomColor) (UIColor *) randomColor; @end #import "UIColorRandomColor.h" @implementation UIColor (RandomColor) (UIColor *) randomColor { CGFloat hue = ( arc4random() % 256 / 256.0 ); //0.0 to 1.0 CGFloat satura

#import

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@interface UIColor (RandomColor)
+(UIColor *) randomColor;
@end

#import "UIColor+RandomColor.h"

@implementation UIColor (RandomColor)

+(UIColor *) randomColor
{
CGFloat hue = ( arc4random() % 256 / 256.0 ); //0.0 to 1.0
CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5; // 0.5 to 1.0,away from white www.stuhack.com
CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5; //0.5 to 1.0,away from black
return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];

@end 

将随机生成的颜色绘制成图片。

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-(void)createImage
{ copyright www.stuhack.com

NSString* path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) objectAtIndex:0];


path = @"/Users/shouqiangwei/Desktop/未命名文件夹 2";
NSLog(@"path = %@",path);
NSString *imgName;
NSString *imgURL;
NSString *markNum;
UIImage *img;
NSData *imgData;
NSError *err; 
int width= 1000, height=1000, fontSize;
CGPoint markPoint;
int baseLength = 320; 
NSFileManager *fm = [NSFileManagerdefaultManager];
for (int i=0; i<1000; i++) {

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UIColor *color = [UIColorrandomColor]; 
[_currentColorImageViewsetBackgroundColor:color]; www.stuhack.com

imgName = [NSString stringWithFormat:@"%i.jpg", i+1];
_lblCount.text = imgName;

imgURL = [path stringByAppendingPathComponent:imgName];
if (![fm fileExistsAtPath:imgURL]) {
const CGFloat *colorComps = CGColorGetComponents(color.CGColor);
markNum = [NSString stringWithFormat:@"%i", i+1];

fontSize = width / 5;
markPoint = CGPointMake(fontSize/2, fontSize/2);

UIGraphicsBeginImageContext(CGSizeMake(width, height));
CGContextRef ctx =UIGraphicsGetCurrentContext();
CGContextSetRGBFillColor(ctx, colorComps[0], colorComps[1], colorComps[2], colorComps[3]);
CGContextFillRect(ctx, CGRectMake(0, 0, width, height));
CGContextSetRGBFillColor(ctx, 1.0, 1.0, 1.0,1.0);

[markNum drawAtPoint:markPoint withFont:[UIFont systemFontOfSize:fontSize]];
img = UIGraphicsGetImageFromCurrentImageContext();
self.imageView.image= img; copyright www.stuhack.com
UIGraphicsEndImageContext();


//创建到本地。
imgData = [NSDatadataWithData:UIImageJPEGRepresentation(img,1.0f)];

[imgData writeToFile:imgURLoptions:NSDataWritingAtomicerror:&err];

if (err) {
NSLog(@"error: %@\nimage:%@", err.localizedDescription, imgName);
} else {
NSLog(@"done: %@", imgName);
}
}
}

}

iOS 随机颜色（UIColor）

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原文地址：http://www.cnblogs.com/qq449832375/p/4672303.html