Add text to CALayer

by 
CATextLayer *label = [[CATextLayer alloc] init];
[label setFont:@"Helvetica-Bold"];
[label setFontSize:20];  
[label setFrame:validFrame];
[label setString:@"Hello"];
[label setAlignmentMode:kCAAlignmentCenter];
[label setForegroundColor:[[UIColor whiteColor] CGColor]];
[layer addSublayer:label];

[label release];

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