摘要：获得屏幕图像,label的动态size,时间戳转化为时间,RGB转化成颜色,加边框,ios/98852.html">ios/184462.html">压缩图片,textfield的placeholder,图片做灰度处理
1.获得屏幕图像
- (UIImage *)imageFromView: (UIView *) theView
{
UIGraphicsBeginImageContext(theView.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[theView.layer renderInContext:context];
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}
2.label的动态size
- (CGSize)labelAutoCalculateRectWith:(NSString*)text FontSize:(CGFloat)fontSize MaxSize:(CGSize)maxSize
{
NSMutableParagraphStyle* paragraphStyle = [[NSMutableParagraphStyle alloc]init]; paragraphStyle.lineBreakMode=NSLineBreakByWordWrapping;
NSDictionary* attributes =@{NSFontAttributeName:[UIFont fontWithName:@"MicrosoftYaHei" size:fontSize],NSParagraphStyleAttributeName:paragraphStyle.copy};
CGSize labelSize = [text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading|NSStringDrawingTruncatesLastVisibleLine attributes:attributes context:nil].size;
labelSize.height=ceil(labelSize.height);
return labelSize;
}
3.时间戳转化为时间
-(NSString*)TimeTrasformWithDate:(NSString *)dateString
{
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"YY-MM-dd HH:mm"];
[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"Asia/Beijing"]];
NSString *date = [formatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:dateString.integerValue]];
//NSLog(@"date1:%@",date);
return date;
}
4.RGB转化成颜色
+ (UIColor *)colorFromHexRGB:(NSString *)inColorString
{
UIColor *result = nil;
unsigned int colorCode = 0;
unsigned char redByte, greenByte, blueByte;
if (nil != inColorString)
{
NSScanner *scanner = [NSScanner scannerWithString:inColorString];
(void) [scanner scanHexInt:&colorCode]; // ignore error
}
redByte = (unsigned char) (colorCode >> 16);
greenByte = (unsigned char) (colorCode >> 8);
blueByte = (unsigned char) (colorCode); // masks off high bits
result = [UIColor
colorWithRed: (float)redByte / 0xff
green: (float)greenByte/ 0xff
blue: (float)blueByte / 0xff
alpha:1.0];
return result;
}
5.加边框
UIRectCorner corners=UIRectCornerTopLeft | UIRectCornerTopRight;
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:corners
cornerRadii:CGSizeMake(4, 0)];
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = view.bounds;
maskLayer.path = maskPath.CGPath;
view.layer.mask = maskLayer;
6.//压缩图片
