ios图片的保存修改等处理方法

1、等比缩放- (UIImage *) scaleImage:(UIImage *)image toScale:(float)scaleSize {UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize);[image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];UIImage *scaledImage= UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();returnscaledImage;}

3、处理某个特定的view只要是继承UIView的object 都可以处理必须先import QuzrtzCore.framework-(UIImage*) captureView:(UIView *)theView {CGRect rect = theView.frame;UIGraphicsBeginImageContext(rect.size);CGContextRef context = UIGraphicsGetCurrentContext();[theView.layer renderInContext:context];UIImage *img = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();returnimg;}

5、UILabel根据text自动调整大小label.text = @"**********";CGRect frame = label.frame;frame.size.height = 10000;// 设置一个很大的高度label.frame = frame;[label sizeToFit];frame.size.height = label.frame.size.height;label.frame = frame;