将View转化为图片

在view上面添加一张图片，然后将View转化为一张图片

+ (UIImage *)getBgViewFrame:(CGRect)rect withDefaultImage:(UIImage *)placeImage {

UIView *bgView = [[UIView alloc]initWithFrame:rect];

bgView.backgroundColor =[self colorFromHexString:@"#f0f0f0"];

UIImageView *imgView = [[UIImageView alloc]init];

imgView.image = placeImage;

[bgView addSubview:imgView];

imgView.sd_layout

.centerXEqualToView(bgView)

.centerYEqualToView(bgView)

.widthIs(placeImage.size.width)

.heightIs(placeImage.size.height);

CGSize size = rect.size;

// 下面方法，第一个参数表示区域大小。第二个参数表示是否是非透明的。如果需要显示半透明效果，需要传NO，否则传YES。第三个参数就是屏幕密度了

UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);

[bgView.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return image;

}

//16进制颜色转成UIColor类型

- (UIColor *) colorFromHexString:(NSString *)hexString {

NSString *cleanString = [hexString stringByReplacingOccurrencesOfString:@"#" withString:@""];

{

if([cleanString length] == 3) {

cleanString = [NSString stringWithFormat:@"%@%@%@%@%@%@",

[cleanString substringWithRange:NSMakeRange(0, 1)],[cleanString substringWithRange:NSMakeRange(0, 1)],

[cleanString substringWithRange:NSMakeRange(1, 1)],[cleanString substringWithRange:NSMakeRange(1, 1)],

[cleanString substringWithRange:NSMakeRange(2, 1)],[cleanString substringWithRange:NSMakeRange(2, 1)]];

}

}

if([cleanString length] == 6) {

cleanString = [cleanString stringByAppendingString:@"ff"];

}

unsigned int baseValue;

[[NSScanner scannerWithString:cleanString] scanHexInt:&baseValue];

float red = ((baseValue >> 24) & 0xFF)/255.0f;

float green = ((baseValue >> 16) & 0xFF)/255.0f;

float blue = ((baseValue >> 8) & 0xFF)/255.0f;

float alpha = ((baseValue >> 0) & 0xFF)/255.0f;

return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];

}