1.显示系统隐藏文件：
defaults write com.apple.finder AppleShowAllFiles YES
2.自己定义系统tableViewCell 的imageView的大小：
CGSize itemSize = CGSizeMake(40, 40);
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[cell.imageView.image drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
3.富文本编辑 实现不同文字的对齐：
NSMutableAttributedString *mutableString = [[NSMutableAttributedString alloc] initWithString:string];
[mutableString addAttribute:NSForegroundColorAttributeName value:[UIColor clearColor] range:NSMakeRange(1, 1)];
_label.attributedText = departString;
4.富文本编辑显示图片：
NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
textAttachment.image = [UIImage imageNamd:];
label.attributedText = [NSAttributedString attributedStringWithAttachment:textAttachment];
5.获取当前视图的导航控制器：
- (UINavigationController*)getNavigationController
{
UINavigationController* nav = nil;
for (UIView* view = self.view; view; view = view.superview)
{
UIResponder* responder = view.nextResponder;
if ([responder isKindOfClass:UIViewController.class])
{
UIViewController* vc = (UIViewController*)responder;
if (vc.navigationController)
{
nav = vc.navigationController;
break;
}
}
}
return nav;
}
6.修复UITableView的分割线偏移的BUG
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {
[self.tableView setSeparatorInset:UIEdgeInsetsZero];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {
[self.tableView setLayoutMargins:UIEdgeInsetsZero];
}
//此代理方法用来重置cell分割线
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
[cell setSeparatorInset:UIEdgeInsetsZero];
}
if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}
#pragma mark 处理图片的压缩问题
- (UIImage*)compressedImage:(UIImage*)image
{
const CGFloat scaleSize = 0.5;//压缩比
UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize));
[image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];
UIImage* compressedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return compressedImage;
}
7.iOS 时间比较
- (int)compareOneDay:(NSString*)oneDay withAnotherDay:(NSString*)anotherDay
{
NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSDate* dateA = [dateFormatter dateFromString:oneDay];
NSDate* dateB = [dateFormatter dateFromString:anotherDay];
NSComparisonResult result = [dateA compare:dateB];
if (result == NSOrderedDescending) {
//NSLog(@"Date1 is in the future");
return 1;
}
else if (result == NSOrderedAscending) {
//NSLog(@"Date1 is in the past");
return -1;
}
//NSLog(@"Both dates are the same");
return 0;
}
8.按要求截取相应的整数部分和小数部分
/**
* 数字截取相应的整数部分和小数部分
*
* @param text 要截取的数据
* @param num 整数部分位数
* @param decimal 小数部分位数
*
* @return 需要的字符串
*/
-(NSString *)textWithText:(NSString *)text addNumWithCount:(int )num addDecimalWithCount:(int)decimal
{ if ([text containsString:@"."])
{
// 只填了一个小数点 补0
if ([text rangeOfString:@"."].location==text.length-decimal)
{ for (int i=0; inum+decimal+1)
{
text = [text substringFromIndex:text.length-num-decimal-1];
}
}else
{
//全部整数不处理小数部分 需要处理可以在后面补0
if (text.length>num)
{
text = [text substringFromIndex:text.length-num];
}
}
return text;
}
8.时间戳转为时间(13位时间戳)
NSTimeInterval interval = [self.searchContentModel.createTime doubleValue]/1000.0;
NSDate *date = [NSDate dateWithTimeIntervalSince1970:interval];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];