#import <UIKit/UIKit.h>
@interface UIColor (RandomColor)
+(UIColor *) randomColor;
@end
#import "UIColor+RandomColor.h"
@implementation UIColor (RandomColor)
+(UIColor *) randomColor
{
CGFloat hue = (
arc4random() % /
256.0 ); //0.0 to 1.0
CGFloat saturation = (
arc4random() % /
256.0 ) + 0.5;
// 0.5 to 1.0,away from white
CGFloat brightness = (
arc4random() % /
256.0 ) + 0.5;
//0.5 to 1.0,away from black
];
@end
将随机生成的颜色绘制成图片。
-(void)createImage
{
NSString* path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)
objectAtIndex];
path = @"/Users/shouqiangwei/Desktop/未命名目录 2";
NSLog(@"path = %@",path);
NSString *imgName;
NSString *imgURL;
NSString *markNum;
UIImage *img;
NSData *imgData;
NSError *err;
, height=, fontSize;
CGPoint markPoint;
;
NSFileManager *fm = [NSFileManagerdefaultManager];
; i<; i++) {
UIColor *color = [UIColorrandomColor];
[_currentColorImageViewsetBackgroundColor:color];
imgName = [NSString
stringWithFormat:];
_lblCount.text = imgName;
imgURL = [path stringByAppendingPathComponent:imgName];
if (![fm fileExistsAtPath:imgURL]) {
const
CGFloat *colorComps = CGColorGetComponents(color.CGColor);
markNum = [NSString
stringWithFormat:];
fontSize = width / ;
markPoint = , fontSize/);
UIGraphicsBeginImageContext(CGSizeMake(width, height));
CGContextRef ctx =UIGraphicsGetCurrentContext();
], colorComps[], colorComps[], colorComps[]);
CGContextFillRect(ctx,
CGRectMake(, , width, height));
CGContextSetRGBFillColor(ctx,
1.0, 1.0, 1.0,1.0);
//创建图片上的数字。
[markNum drawAtPoint:markPoint
withFont:[UIFont
systemFontOfSize:fontSize]];
img = UIGraphicsGetImageFromCurrentImageContext();
self.imageView.image= img;
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);
}
}
}
}
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