tableView的分割线设置为全行的方法
- (void)viewDidLayoutSubviews
{
[super viewDidLayoutSubviews];
if ([_tableView respondsToSelector:@selector(setSeparatorInset:)]) {
[_tableView setSeparatorInset:UIEdgeInsetsZero];
}
}
1.如何讲一个view保存为PDF格式
-(void)createPDFfromUIView:(UIView *)aView saveToDocumentsWithFileName:(NSString *)afileName{
NSMutableData *pdfData = [NSMutableData data];
UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
UIGraphicsBeginPDFPage();
CGContextRef pdfContext = UIGraphicsGetCurrentContext();
[aView.layer renderInContext:pdfContext];
UIGraphicsEndPDFContext();
NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [documentDirectories objectAtIndex:0];
NSString *documentDirectoryFileName = [documentDirectory stringByAppendingPathComponent:afileName];
[pdfData writeToFile:documentDirectoryFileName atomically:YES];
}
2.UIWebView添加单击手势不响应
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(webviewClick)];
tap.delegate = self;
[_webView addGestureRecognizer:tap];
因为webview本身有一个单击手势,所以在添加会造成手势冲突,从而不响应,需要绑定手势代理,并实现下面的代理方法
.允许多个手势识别器共同识别
默认情况下，两个gesture recognizers不会同时识别它们的手势,但是你可以实现UIGestureRecognizerDelegate协议中的
gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:方法对其进行控制。这个方法在这两个gesture recognizers中的任意一个将block另一个的触摸事件时调用，如果返回YES,则两个gesture recognizers可同时识别，如果返回NO，则并不保证两个gesture recognizers必不能同时识别，因为另外一个gesture recognizer的此方法可能返回YES。也就是说两个gesture recognizers的delegate方法只要任意一个返回YES，则这两个就可以同时识别；只有两个都返回NO的时候，才是互斥的。默认情况下是返回NO。
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(nonnull UIGestureRecognizer *)otherGestureRecognizer{
return YES;
}
3.隐藏UITextView/UITextField光标
textField.tintColor = [UIColor clearColor];
4.当UITextView/UITextField中没有文字的时候,禁用回车键
textField.enablesReturnKeyAutomatically = YES;
5.单个页面多个网络请求的情况，需要监听所有网络请求结束后刷新UI
dispatch_group_t group = dispatch_group_create();
dispatch_queue_t serialQueue = dispatch_queue_create("com.wzb.test.www", DISPATCH_QUEUE_SERIAL);
dispatch_group_enter(group);
dispatch_group_async(group, serialQueue, ^{
// 网络请求一
[WebClick getDataSuccess:^(ResponseModel *model) {
dispatch_group_leave(group);
} failure:^(NSString *err) {
dispatch_group_leave(group);
}];
});
dispatch_group_enter(group);
dispatch_group_async(group, serialQueue, ^{
// 网络请求二
[WebClick getDataSuccess:getBigTypeRM onSuccess:^(ResponseModel *model) {
dispatch_group_leave(group);
} failure:^(NSString *errorString) {
dispatch_group_leave(group);
}];
});
dispatch_group_enter(group);
dispatch_group_async(group, serialQueue, ^{
// 网络请求三
[WebClick getDataSuccess:^{
dispatch_group_leave(group);
} failure:^(NSString *errorString) {
dispatch_group_leave(group);
}];
});
// 所有网络请求结束后会来到这个方法
dispatch_group_notify(group, serialQueue, ^{
dispatch_async(dispatch_get_global_queue(0, 0), ^{
dispatch_async(dispatch_get_main_queue(), ^{
// 刷新UI
});
});
});
6.IOS中截屏的方法
- (UIImage *)captureScrollView:(UIScrollView *)scrollView{
UIImage* image = nil;
UIGraphicsBeginImageContext(scrollView.contentSize);
{
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();
if (image != nil) {
return image;
}
return nil;
}