设置文字并调整UIButton里面的文字位置

不使用alloc初始化：

_battleBtn = [UIButton buttonWithType:UIButtonTypeCustom];

设置文字：

[_battleBtn setTitle:@"挑战TA" forState:UIControlStateNormal];

设置背景：

[_battleBtn setBackgroundImage:battleBtnBgImg forState:UIControlStateNormal];

调整文字位置，设置字体等：

CGRect  btnRect = CGRectMake(
                             360 * 0.5f,
                             352 * 0.5f,
                             107,
                             49
                             );

_battleBtn = [[UIButton alloc] initWithFrame:btnRect];
[_battleBtn setTitle:FoolLocalizedString(@"知道", nil) forState:UIControlStateNormal];
[_battleBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
_battleBtn.titleLabel.font = [UIFont systemFontOfSize:18];
_battleBtn.titleLabel.adjustsFontSizeToFitWidth = YES;
_battleBtn.titleLabel.minimumFontSize = 5;
[_battleBtn setTitleEdgeInsets:UIEdgeInsetsMake(0, 10, 18, 0)];
[_battleBtn setBackgroundImage:[UIImage imageNamed:@"btn.png"] forState:UIControlStateNormal];
[_battleBtn addTarget:self action:@selector(closeLayer) forControlEvents:UIControlEventTouchUpInside];