#import <QuartzCore/QuartzCore.h>
#import <CoreGraphics/CoreGraphics.h>
#import <UIKit/UIKitDefines.h>
#define SCREENWIDTH ([UIScreen mainScreen].bounds.size.width)
#define SCREENHEIGHT ([UIScreen mainScreen].bounds.size.height)
//根据原有图片 绘制一个全屏宽，图等高两侧自定义背景色(红色)的图片
- (UIImage *)shot:(UIImage *)oldImage backgroundColor:(UIColor *)color{
CGSize size = CGSizeMake(SCREENWIDTH, oldImage.size.height);
UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREENWIDTH, size.height)];
backView.backgroundColor = color;
UIImageView *imageView = [[UIImageView alloc] initWithImage:oldImage];
CGFloat imageX = (SCREENWIDTH - oldImage.size.width) * 0.5;
imageView.frame = CGRectMake(imageX, 0, oldImage.size.width, oldImage.size.height);
[backView addSubview:imageView];
UIGraphicsBeginImageContext(backView.bounds.size);
[backView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image= UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
//根据原有图片 绘制一个全屏宽，图等高两侧自定义背景色(白色)的图片
- (UIImage *)snapshotScreenInView:(UIImage *)oldImage backgroundColor:(UIColor *)color{
CGSize size = CGSizeMake(SCREENWIDTH, oldImage.size.height);
UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREENWIDTH, size.height)];
backView.backgroundColor = color;
UIImageView *imageView = [[UIImageView alloc] initWithImage:oldImage];
CGFloat imageX = (SCREENWIDTH - oldImage.size.width) * 0.5;
imageView.frame = CGRectMake(imageX, 0, oldImage.size.width, oldImage.size.height);
[backView addSubview:imageView];
UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);
CGRect rect = backView.frame;
[backView drawViewHierarchyInRect:rect afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
//根据一个字符串，绘制一张图片，自定义：位置（居左，中，右），字体间距，大小，颜色，图片背景色
- (UIImage *)getImageWithString:(NSString *)string font:(UIFont *)font textColor:(UIColor *)color size:(CGSize)size {
UILabel *label = [[UILabel alloc] init];
label.backgroundColor = [UIColor whiteColor];
if (size.width == MAXFLOAT) {
//计算宽度
label.numberOfLines = 1;
label.frame = CGRectMake(0, 0, 0, size.height);
}else if (size.height == MAXFLOAT) {
//计算高度
label.numberOfLines = 0;
label.frame = CGRectMake(0, 0, size.width, 0);
}
NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:string];
NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
paragraphStyle.alignment = NSTextAlignmentCenter;
[attributedText addAttributes:@{NSFontAttributeName:font,
NSForegroundColorAttributeName:color,
NSParagraphStyleAttributeName:paragraphStyle,
NSKernAttributeName:@3} range:NSMakeRange(0, string.length)];
label.attributedText = attributedText;
[label sizeToFit];
CGSize realSize = label.frame.size;
//绘图关键
UIGraphicsBeginImageContext(realSize);
[label.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image= UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}