iPhone开发部分总结_1

本文介绍了多项iOS开发实用技巧，包括字符串处理、plist文件读取、界面元素美化等，还涉及了UITableView、UITableViewCell的使用及自定义设置。

1.取字符串中的某段字符串

    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

    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 <QuartzCore/QuartzCore.h>

二.object.layer.masksToBounds=YES;

三.object.layer.cornerRadius=XXX;

    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

    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section scrollPosition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

- (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;
}