iPhone基础

从一个界面push到下一界面左上角返回按钮文字设置

在父viewController中如下设置：

    UIBarButtonItem *backbutton = [[UIBarButtonItem alloc]init];

    backbutton.title = @"返回列表";

    self.navigationItem.backBarButtonItem = backbutton;

    [backbutton release];

navigationbar的back键触发其他事件

UIButton *back =[[UIButton alloc] initWithFrame:CGRectMake(200, 25, 63, 30)];

[back addTarget:self action:@selector(reloadRowData:) forControlEvents:UIControlEventTouchUpInside];

[back setImage:[UIImage imageNamed:@"返回按钮.png"] forState:UIControlStateNormal];

UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:back];

self.navigationItem.leftBarButtonItem = loginButtonItem

[back release];

[backButtonItem release];

防止屏幕暗掉锁屏

[ [

UIApplication

sharedApplication ]

setIdleTimerDisabled

: YES ]

;

将图片从左到右翻页效果显示
   
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 0, 470)];
    [imageView setImage:[UIImage imageNamed:@"Bg.jpg"]];
    self.myImageView =imageView;
    [self.view addSubview:imageView];
    [imageView release];
    CGContextRef context = UIGraphicsGetCurrentContext();
    [UIView beginAnimations:nil context:context];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationDuration:0.5];
    [myImageView setFrame:CGRectMake(0, 0, 310, 470)];   
    [UIView commitAnimations];

让覆盖在下面层的视图接受触摸事件

searchImage.exclusiveTouch = YES;//第一层
searchImage.userInteractionEnabled = NO;
myMapView.exclusiveTouch = NO;//第二层
myMapView.userInteractionEnabled = YES;

View的缩放

NSValue *touchPointValue = [[NSValue valueWithCGPoint:CGPointMake(100,100)] retain];
[UIView beginAnimations:nil context:touchPointValue];
transform = CGAffineTransformMakeScale(0.1,0.21);
firstPieceView.transform = transform;
[UIView commitAnimations];   

代码循环添加按钮，其他空间也可以用类似方法添加

- (void)viewDidLoad {
    [super viewDidLoad];
    for(int i = 0; i < 5; i++){
        CGRect frame;
        Btn[i] = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
        [Btn[i] setImage:[UIImage imageNamed:@"Button.png"] forState:UIControlStateNormal];//设置按钮图片
        frame.size.width = 55;//设置按钮坐标及大小
        frame.size.height = 84;
        frame.origin.x = (i%5)*57+5;
        frame.origin.y = 10;
        [Btn[i] setFrame:frame];
        [Btn[i] setBackgroundColor:[UIColor clearColor]];
        [Btn[i] addTarget:self act ion:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:Btn[i]];
        [Btn[i] release];
    }
}
//响应按钮事件
-(void)btnPressed:(id)sender{
    for(int i = 0; i < 5;i++){
        if([sender isEqual:Btn[i]]){
            NSLog(@"Btn[%d]:",i);
        }
    }
}

去除nsstring中的空格，table 以及newline，nextline

NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet ];
NSString * username = [mUsernameField stringValue];
username = [username stringByTrimmingCharactersInSet :whitespace];