Which of the following is not a valid Touch method with respect to Cocoa Touch programming?

Which will return the device's current location?

Correct way to print out stack/trace to the console/log in Cocoa application?

Which is not a valid UIGestureRecognizer?

Which will change the placeholder text color in UITextField?

Which framework is needed to round corners of UILabel?

Which OpenGL ES objects is a simple 2D graphics image in a specified format?

When you send an object a retain message in Memory Management using Objective-C, what will happen?

Consider the following code with 2 alternatives of vector operator for OpenGL ES: highp float f0,f1; highp vec4 v0, v1; Alternative 1: v0 = (v1*f0)*f1; Alternative 2: v0 = v1 * (f0 * f1); Which alternative demonstrates proper use of vector operations?

What will be the return value of CFHTTPMessageApplyCredentials function of CFHTTPMessage class if the authentication is successful?

Which type of audio files has NO size restriction?