iOS 标签字体加粗

UILabel *addLab = [[UILabel alloc] initWithFrame:CGRectMake(kWidth - 80, 10, 70, 30)];

addLab.text = @"已添加";

addLab.textAlignment = NSTextAlignmentCenter;

addLab.font = [UIFont systemFontOfSize:12 weight:1];

addLab.textColor = kTitleLightColor;

weight为0正常，为1加粗