日常随笔

1.复制

UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];

[pasteboard setString:self.cutStr];

2.状态栏

[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault;

3.设置导航栏按钮的位置

UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];

space.width = -11;

[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects:space,rightItem, nil]];

4.UILabel内容省略部分

_nameLabel.lineBreakMode = NSLineBreakByTruncatingMiddle;//省略号在中间

5.NSUserDefaults是定时把缓存中的数据写入磁盘的，而不是即时写入，为了防止在写完NSUserDefaults后程序退出导致的数据丢失，可以在写入数据后使用synchronize强制立即将数据写入磁盘

6.视图旋转

self.infoButton.transform=CGAffineTransformRotate(self.infoButton.transform, M_PI);

7.关闭侧滑返回

self.rt_disableInteractivePop = YES;

8.显示html标签

NSString * htmlString = @"<html><body> Some html string \n <font size=\"13\" color=\"red\">This is some text!</font> </body></html>";

NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];

UILabel * myLabel = [[UILabel alloc] initWithFrame:self.bounds];

myLabel.attributedText = attrStr;

[self addSubview:myLabel];

9.提取html中的字符串

NSString *html = @"<html><body> Some html string \n <font size=\"13\" color=\"red\">This is some text!</font> </body></html>";

NSScanner *theScanner;

NSString *text = nil;

theScanner = [NSScanner scannerWithString:html];

while ([theScanner isAtEnd] == NO) {

[theScanner scanUpToString:@"<" intoString:NULL] ;

[theScanner scanUpToString:@">" intoString:&text] ;

html = [html stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"%@>", text] withString:@""];

}

10. 修改占位文字上下居中

NSMutableParagraphStyle *style = [_textfield.defaultTextAttributes[NSParagraphStyleAttributeName] mutableCopy];

style.minimumLineHeight = _textfield.font.lineHeight - (_textfield.font.lineHeight - [UIFont systemFontOfSize:12.0].lineHeight) / 2.0;

_textfield.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@“占位文字内容” attributes:@{NSForegroundColorAttributeName: [UIColor lightGrayColor],NSFontAttributeName : [UIFont systemFontOfSize:12.0],NSParagraphStyleAttributeName : style}];

[senderView addSubview:_textfield];

11.反编译友盟错误

dwarfdump --arch=arm64 --lookup 0x1008fe24c /Users/cf8_ios_01/Library/Developer/Xcode/Archives/2017-05-09/SimulationStocks\ 17-5-9\ 下午2.26.xcarchive/dSYMs/SimulationStocks.app.dSYM/Contents/Resources/DWARF/SimulationStocks

12. 控件在设置阴影的之前一定要先设置背景颜色否则阴影效果显示不出来

13. 图片拉伸

image = [image resizableImageWithCapInsets:UIEdgeInsetsMake( 0, 7, 0, image.size.width-7) resizingMode:UIImageResizingModeStretch];

14. APP打开QQ对话框

NSString *qqNumber = @“QQ号”;

NSString *openQQUrl = [NSString stringWithFormat:@"mqq://im/chat?chat_type=wpa&uin=%@&version=1&src_type=web",qqNumber];

NSURL *url = [NSURL URLWithString:openQQUrl];

[[UIApplication sharedApplication] openURL:url];

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