iOS小方法
1.取字符串中的某段字符串[plain] view plaincopyprint? NSString *str=@"12sadfsdf56afsdf"; NSLog(@"%@",str); NSString *thrStr = [strstringByReplacingOccurrencesOfString:@"56"withString:@"88"]; NSLog(@"%@",thrStr); 即把12sadfsdf56afsdf中的56替换为88，替换后字符串为：12sadfsdf88afsdf 2.简单plist获取 [plain] view plaincopyprint? NSString *path = [[NSBundlemainBundle]pathForResource:@"Array"ofType:@"plist"]; NSMutableDictionary *data = [[NSMutableDictionaryalloc]initWithContentsOfFile:path]; NSLog(@"%d",[datacount]); NSLog(@"%@",[dataallValues]); NSLog(@"------------") ; NSArray *ary = [dataallKeys]; NSLog(@"%d",[arycount]); NSArray *array = [NSArrayarrayWithArray:ary]; for(int i=0;i<[arraycount];i++) { NSLog(@"\n value = %@",[arrayobjectAtIndex:i]); } NSArray *getArray = [[dataallValues]objectAtIndex:5]; NSLog(@"get_array:%@",getArray); 3.状态栏和UINavigationBar设置成透明 [[UIApplicationsharedApplication]setStatusBarStyle:UIStatusBarStyleBlackTranslucent];//状态栏设置为透明 theNavigationController.navigationBar.barStyle =UIBarStyleBlackTranslucent;//设置navigationBar为透明 4.设置object圆角，如UIView、UIImageView等 简单几步： 一.导入QuartzCore.framework框架#import 二.object.layer.masksToBounds=YES; 三.object.layer.cornerRadius=XXX; [plain] view plaincopyprint? UIImageView *testImageView = [[UIImageViewalloc]initWithImage:[UIImageimageNamed:@"1.jpg"]]; [testImageViewsetFrame:CGRectMake(20,20,100,100)]; testImageView.layer.masksToBounds =YES; testImageView.layer.cornerRadius =50/2;//设置的角度，改变查看效果 testImageView.layer.borderWidth =5;//边框宽度 testImageView.layer.borderColor = [UIColoryellowColor].CGColor;//边框颜色 [self.viewaddSubview:testImageView]; [testImageViewrelease]; 5.程序是启动状态时设置屏幕一直亮 UIApplication *appDelegate = [UIApplicationsharedApplication]; appDelegate.idleTimerDisabled =YES; 6.设置UITableViewCell显示子标题初始化时：cell = [[UITableViewCellalloc]initWithStyle:UITableViewCellStyleSubtitlereuseIdentifier:CellIdentifier]; 此处样式应注意，即设置为显示子标题样式，默认样式为不显示子标题，设置完后可用： cell.detailTextLabel.text =@"详细标签";设置子标题 7.给UIView设置阴影效果 [plain] view plaincopyprint? UIView *showView = [[UIViewalloc]initWithFrame:CGRectMake(10,150,100,100)]; showView.backgroundColor = [UIColorredColor]; showView.layer.shadowOffset =CGSizeMake(15,5); showView.layer.shadowOpacity =0.6; showView.layer.shadowColor = [UIColorblackColor].CGColor; [self.viewaddSubview:showView]; [showViewrelease]; 8.设置UITableView选中行数的位置 [self.tableViewselectRowAtIndexPath:[NSIndexPathindexPathForRow:5inSection:0]animated:NOscrollPosition:UITableViewScrollPositionMiddle]; //selectRowAtIndexPath设置行数和sectionscrollPosition设置滚动到的位置（4项可供选择） 9.UITextField每次操作调用的代理，可根据需求作相应改变- (BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSMutableString *newString = [[textField.textmutableCopy]autorelease]; [newStringreplaceCharactersInRange:rangewithString:string];//得到改变的字符串 } 10.如何用UIColor生成UIImage [plain] view plaincopyprint? - (void)viewDidLoad { [superviewDidLoad]; UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(10,10,100,100)]; UIImage *image = [self createImageWithColor:[UIColoryellowColor]];//生成一张黄颜色的图片 [imageViewsetImage:image]; [self.viewaddSubview:imageView]; [imageViewrelease]; } - (UIImage *) createImageWithColor: (UIColor *) color { CGRect rect = CGRectMake(0.0f,0.0f,1.0f,1.0f); UIGraphicsBeginImageContext(rect.size); CGContextRef context =UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(context, [colorCGColor]); CGContextFillRect(context, rect); UIImage *theImage =UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return theImage; } 本文转自 卓行天下 51CTO博客，原文链接：http://blog.51cto.com/9951038/1827817，如需转载请自行联系原作者
