Drawing a circle in UIView is similar to drawing a border which is shown in the previous post.
iPhone – UIView with Border
Please follow the above example and modify the UIViewWithBorder.m as below. Continue reading iPhone – Draw a Circle in UIView
Tag Archives: UIView
iPhone – UIView with Border
The border of the view could be drawn in the drawRect method in the view. Here is an example.
1. Create a UIView subclass (ex. UIViewWithBorder)
2. Construct the drawRect method In the UIViewWithBorder.m as follow Continue reading iPhone – UIView with Border
iPhone – Set Background Image for UIView
In iPhone SDK, there is no setBackgroundImage function for setting an background image of an UIView. But actually, this can be done by the setBackgroundColor function. The following code will set the background view to Red.
self.view.backgroundColor = [UIColor redColor];
iPhone – Add and Remove Subviews
The layout of an UIView in iPhone Application can be created and modified either by the Interface Builder or by code. If you make it by Interface Builder, you have to wire the items u created to File Owner.
On the other hand, u can make an Item on the UIView by code. The following example will created a “Hello World” UILabel at coordinate (10, 15) with size equals to 40 x 20;
// Create the UILabel instance UILabel *aLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 15, 40, 20)]; // Set the tag of aLabel aLabel.tag = 1; // Set the text aLabel.text = @"Hello World"; // Add the UILabel view to UIView associated with the controller [self.view addSubview:aLabel]; // Release the memory [aLabel release];
You can add different items such as UIImageView, UITextField etc. Please note that the view tag is the only field to distinguish different subviews.
To remove all the subviews except the one with tag equals to 1, you can use
for (UIView *subview in [self.view subviews]) {
// Only remove the subviews with tag not equal to 1
if (subview.tag != 1) {
[subview removeFromSuperview];
}
}
Done =)
Update @ 2011-06-18: Added the “Release the memory” code. Thanks Luke. =)
Eureka! 