// 1 CGRectInset
If you need to create a rectangle that is either larger or smaller than an existing rectangle, centered on the same point, try CGRectInset:
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CGRect rect5 = CGRectMake(100, 100, 100, 100); // Use positive values for a smaller rectangle CGRect rect6 = CGRectInset(rect, 25, 25); NSLog(@"%rect5: %@", NSStringFromCGRect(rect5)); NSLog(@"%rect6: %@", NSStringFromCGRect(rect6)); ... CGRect rect7 = CGRectMake(100, 100, 100, 100); // Use negative values for a larger rectangle CGRect rect8 = CGRectInset(rect, -25, -25); NSLog(@"rect7: %@", NSStringFromCGRect(rect7)); NSLog(@"rect8: %@", NSStringFromCGRect(rect8)); |
原文：http://www.cnblogs.com/puppyb2m/p/4574022.html