As UIButton exposes its titleLabel starting from iPhone OS 3.0 you must set font to it directly:
[button.titleLabel setFont:[UIFont boldSystemFontOfSize:15]];
UIButton setfont is depreciated
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As UIButton exposes its titleLabel starting from iPhone OS 3.0 you must set font to it directly:
[button.titleLabel setFont:[UIFont boldSystemFontOfSize:15]];