o CGPoint , ad esempio. The syntax NSLog(@"%@", ... ); works and is used to obtain information about objects, but does not work on C data types such as struct CGRect or CGPoint , for example. o NSStringFromCGPoint : To take advantage of NSLog(@"%@", ... ); even on C-style structs can rely on conversion functions like NSStringFromCGRect() or NSStringFromCGPoint :
1 2 3 4 5 | CGRect ) { 10 , 20 , 30 , 40 } ; CGRect mioRect = (CGRect) {10, 20, 30, 40}; CGPoint ) { 32 , 64 } ; CGPoint mioPoint = (CGPoint) {32, 64}; / / "Info rettangolo: %@" , NSStringFromCGRect ( mioRect ) ) ; NSLog (@ "Info rectangle:% @", NSStringFromCGRect (mioRect)); "Info point: %@" , NSStringFromCGPoint ( mioPoint ) ) ; NSLog (@ "Info point:% @", NSStringFromCGPoint (mioPoint)); |
Specifically, it is possible to improve this procedure writes of small useful macros like:
1 | # Define NSLogRect (rect) NSLog (@ "% s (% 0.0f,% 0.0f)% 0.0f% 0.0fx", # rect, rect.origin.x, rect.origin.y, rect.size.width , rect.size.height) |
Or:
1 2 3 4 | # Define NSLogCGPoint (point) NSLog (@ "% s (% 0.0f,% 0.0f)", # point.x point, Point.y) CGPoint ) { 32 , 64 } ; CGPoint mioPoint = (CGPoint) {32, 64}; ; NSLogCGPoint (mioPoint); |
That will give as output:
1 | 32 , 64 ) mioPoint: (32, 64) |
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