setHTTPBodyStream

remember to set "Content-Length"

uiapplication sharedapplication

life cycle of iphone app

1.

main.m:

main() --> call UIApplicationMain

2.

application delegate

applicationDidFinishLaunching is called

3.

loading app's main nib file

In info.plist, key NSMainNibFile defines main nib file name

main nib file usually contains a window object, app delegate object, etc

create view controller

1. In xcode, create view controller MyViewController.m

2. For IB, create MyView.xib

3. In IB, set file's owner as MyViewController

connect file owner's view outlet to view window

add view method

method 1: with interface builder

1. create a subclass of UIView: newView

2. create a view xib: newView.xib

3. In IB, set view's class as newView

4. In xCode, add new view

NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"newView" owner: self

options:nil];

UIView *view = [nib objectAtIndex: 1];

[self.view addSubview:view];

note: use the index for array of nib to get specific object, such as view

method 2: all within xCode:

CGRect newViewFrame = CGRectMake(0, 0, 50, 50);

UIView *newView = [[UIView alloc] initWithFrame:newViewFrame];

newView.backgroundColor = [UIColor blueColor];

[self.view addSubview:newView];

find memory leak with clang

• Make sure the project default settings are “debug” and “simulator”
• Close Xcode
• open a terminal window and “cd” to the project directory
• run rm -rf /tmp/scan-build*
• run rm -rf build/;scan-build --view xcodebuild
• Open Xcode and fix errors