这几年项目开发中的小程序片段整理
1、cell的几种创建方式：
2、判断webview是否加载完成：
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
//在此处改变headerview的高度
// js获取高度
self.scrollHeight = [[webView stringByEvaluatingJavaScriptFromString: @"document.body.scrollHeight"] floatValue];
if (!webView.isLoading) {
NSString *readyState = [webView stringByEvaluatingJavaScriptFromString:@"document.readyState"];
BOOL complete = [readyState isEqualToString:@"complete"];
if (complete) {
self.isLoadFinish = YES;
}
}
}
3、webview滚动截图：
- (UIImage *)screenShotWithScrollView:(UIScrollView *)scrollView
{
UIImage* image;
UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, NO, [UIScreen mainScreen].scale);
{
CGPoint savedContentOffset = scrollView.contentOffset;
CGRect savedFrame = scrollView.frame;
scrollView.contentOffset = CGPointZero;
scrollView.frame = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);
[scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
image = UIGraphicsGetImageFromCurrentImageContext();
scrollView.contentOffset = savedContentOffset;
scrollView.frame = savedFrame;
}
UIGraphicsEndImageContext();
NSData *data = UIImageJPEGRepresentation(image, [UIScreen mainScreen].scale);
[data writeToFile:[self getPathWithDocument:@"protocol" fileName:@"protocol.png"] atomically:NO];
if (image != nil)
{
return image;
}
return nil;
}
- (NSString *)getPathWithDocument:(NSString *)document fileName:(NSString *)name
{
NSString *path = [NSString stringWithFormat:@"Documents/%@",document];
NSString *fileName = [NSString stringWithFormat:@"%@",name];
path = [NSString getFilePathWithDir:path fileName:fileName];
NSLog(@"path == %@",path);
return path;
}
+ (NSString *)getFilePath:(NSString *)aPath
{
return [NSHomeDirectory() stringByAppendingPathComponent:aPath];
}
+ (NSString *)getFilePathWithDir:(NSString *)aDir fileName:(NSString *)aName
{
NSString *path = [self getFilePath:aDir];
NSFileManager *manager = [NSFileManager defaultManager];
if (![manager fileExistsAtPath:path]) {
[manager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
}
return [path stringByAppendingPathComponent:aName];
}
4、图片合成：
//获得某个范围内的屏幕图像
- (UIImage *)imageFromView:(UIView *)theView atFrame:(CGRect)r
{
UIGraphicsBeginImageContext(CGSizeMake(theView.width, _signatureView.bottom));
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
UIRectClip(r);
[theView.layer renderInContext:context];
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}
- (UIImage *)combine:(UIImage *)topImage bottomImage:(UIImage *)bottomImg imageSacle:(CGFloat)scale
{
CGFloat height = topImage.size.height + bottomImg.size.height;
CGSize offScreenSize = CGSizeMake(self.view.width, height);
UIGraphicsBeginImageContextWithOptions(offScreenSize, YES, scale);
CGRect rect = CGRectMake(0, 0, self.view.width, topImage.size.height);
[topImage drawInRect:rect];
rect.origin.y+=topImage.size.height;
CGRect rect1 = CGRectMake(0, rect.origin.y, self.view.width, bottomImg.size.height);
[bottomImg drawInRect:rect1];
UIImage *imagez = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *data = UIImageJPEGRepresentation(imagez, 0.5);
[data writeToFile:[self getPathWithDocument:@"protocol" fileName:@"protocolSignature.png"] atomically:NO];
return imagez;
}
5、
