好程序员-ios开发小知识点(二).doc

16、程序启动画面大小
iOS设备现在有三种不同的分辨率:iPhone 320x480、iPhone 4 640x960、iPad 768x1024。以前程序的启动画面(图片)只要准备一个 就可以了,但是现在变得复杂多了。下面就是 CocoaChina 会员做得总结
如果一个程序,既支持iPhone又支持iPad,那么它需要包含下面几个图片:
Default- iPad专用竖向启动画面 768x1024或者768x1004
Default- iPad专用横向启动画面 1024x768或者1024x748
Default- iPad专用竖向启动画面(Home按钮在屏幕上面),可省略 768x1024或者768x1004
Default- iPad专用横向启动画面,可省略 1024x768或者1024x748
Default- iPad专用横向启动画面,可省略 1024x768或者1024x748
iPhone默认启动图片,如果没有提供上面几个iPad专用启动图片,(不推荐) 320x480或者320x460
******@ iPhone4启动图片640x960或者640x920
为了在iPad上使用上述的启动画面,: UISupportedInterfaceOrientations。同时,加入值UIInterfaceOrientationPortrait, UIInterfacOrientationPortraitUpsideDown, UIInterfaceOrientationLandscapeLeft, UIInterfaceOrientationLandscapeRight
17、ASIHTTPRequest实现断点下载
- (IBAction)URLFetchWithProgress:(id)sender
{
[startButton setTitle:@"Stop" forState:UIControlStateNormal];
[startButton addTarget:self action:***@selector(stopURLFetchWithProgress:)forControlEvents:UIControlEventTouchUpInside];
NSString*tempFile = [[[[NSBundle mainBundle] bundlePath]ponent]ponent:@""];
if ([[NSFileManager defaultManager] fileExistsAtPath:tempFile]) {
[[NSFileManager defaultManager] removeItemAtPath:tempFile error:nil];
}
[self resumeURLFetchWithProgress:self];
}
- (IBAction)stopURLFetchWithProgress:(id)sender
{
networkQueue = [[workQueue alloc] init];
timer = [NSTimer scheduledTimerWithTimeInterval: target:selfselector:***@selector(updateBandwidthUsageIndicator) userInfo:nil repeats:YES];
timer = nil;
[startButton setTitle:@"Stop" forState:UIControlStateNormal];
[startButton addTarget:self action:***@selector(URLFetchWithProgress:)forControlEvents:UIControlEventTouchUpInside];
[networkQueue cancelAllOperations];
[resumeButton setEnabled:YES];
}
- (IBAction)resumeURLFetchWithProgress:(id)sender
{
[resumeButton setEnabled:NO];