UIImageView * dbImageView = [[UIImageView alloc]init];
UIImage *image = [UIImage imageNamed:@"image"];
image = [image stretchableImageWithLeftCapWidth:image.size.width * 0.7 topCapHeight:image.size.height*0.5];
dbImageView.image= image;
//第一次拉伸宽度=最终宽度/2+原图宽度/2
CGFloattempWidth = [UIScreen mainScreen].bounds.size.width/2+360/2;
UIGraphicsBeginImageContextWithOptions(CGSizeMake(tempWidth, 44), NO, [UIScreen mainScreen].scale);
[dbImageView.imagedrawInRect:CGRectMake(0,0, tempWidth,44)];
image =UIGraphicsGetImageFromCurrentImageContext();
dbImageView.image = [image stretchableImageWithLeftCapWidth:image.size.width *0.2 topCapHeight:image.size.height*0.5];
dbImageView.userInteractionEnabled=YES;
[self.view addSubview:dbImageView];
[dbImageView mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.offset(0);
make.right.offset(0);
make.height.offset(64);
make.bottom.offset(0)
}];
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