图像没有在IOS

Question

压缩使用下面的代码

UIImage *image = [UIImage imageNamed:@"1.png"]; 
CGSize newSize = CGSizeMake(100.0f, 100.0f); 
UIGraphicsBeginImageContext(newSize); 
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)]; 
newImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 
_backgroundImageView.image = newImage; 

Answer 1

如果要压缩图像的图像不会被压缩林

UIImage *img = [UIImage imageNamed:@"yourimagename"]; 
NSData *postData = UIImageJPEGRepresentation(img, 1.0); 
NSInteger imgSizeBytes = [postData length]; 
double imgSizeKBytes = ceil((double)imgSizeBytes/1024); 
NSString *strBytes; 
if(imgSizeKBytes > 1024) { 
    double imgSizeMBytes = (double)imgSizeKBytes/1024; 
    strBytes = [NSString stringWithFormat:@"%.1f MB", imgSizeMBytes]; 
} 
else { 
    strBytes = [NSString stringWithFormat:@"%d KB", (int)imgSizeKBytes]; 
} 

imageView.image = [UIImage imageWithData:postData scale:0.1]; 

你可以通过你的要求的图像尺寸压缩使用下面的代码

NSData *postData = UIImageJPEGRepresentation(img, (double)(100-75)/100); 

上面我给出了75.如果你想给你的大小，给那里。